{"id":1106,"date":"2024-12-20T10:34:50","date_gmt":"2024-12-20T03:34:50","guid":{"rendered":"https:\/\/www.pgtutorial.com\/?page_id=1106"},"modified":"2025-01-05T20:23:28","modified_gmt":"2025-01-05T13:23:28","slug":"postgresql-percent_rank","status":"publish","type":"page","link":"https:\/\/www.pgtutorial.com\/postgresql-window-functions\/postgresql-percent_rank\/","title":{"rendered":"PostgreSQL PERCENT_RANK Window Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: In this tutorial, you&#8217;ll learn how to use the PostgreSQL <code>PERCENT_RANK()<\/code> function to calculate a relative rank of a value in a set of values.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='getting-started-with-the-postgresql-percent_rank-window-function'>Getting Started with the PostgreSQL PERCENT_RANK() Window Function <a href=\"#getting-started-with-the-postgresql-percent_rank-window-function\" class=\"anchor\" id=\"getting-started-with-the-postgresql-percent_rank-window-function\" title=\"Anchor for Getting Started with the PostgreSQL PERCENT_RANK() Window Function\">#<\/a><\/h2>\n\n\n\n<p>The <code>PERCENT_RANK()<\/code> function assigns a relative rank value to each row within a partition based on the values of one or more columns.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='syntax'>Syntax <a href=\"#syntax\" class=\"anchor\" id=\"syntax\" title=\"Anchor for Syntax\">#<\/a><\/h3>\n\n\n\n<p>Here&#8217;s the syntax of the <code>PERCENT_RANK()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\">PERCENT_RANK() <span class=\"hljs-keyword\">OVER<\/span> (\n    &#91;<span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span> expression_list]\n    &#91;<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> expression_list]\n)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>PARTITION BY<\/code>: Divides the result set into partitions where the <code>PERCENT_RANK()<\/code> function applies. This clause is optional. If omitted, the <code>PERCENT_RANK()<\/code> function treats the whole result set as a single partition.<\/li>\n\n\n\n<li><code>ORDER BY<\/code>: Sorts rows within each partition. The values of the columns listed in this clause will determine rank values.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id='return-value'>Return Value <a href=\"#return-value\" class=\"anchor\" id=\"return-value\" title=\"Anchor for Return Value\">#<\/a><\/h3>\n\n\n\n<p>The <code>PERCENT_RANK()<\/code> function returns a number in the range of <strong>(0, 1)<\/strong>. The first value in the set always receives a rank of zero.<\/p>\n\n\n\n<p>If multiple rows have the same value in the columns specified by the <code>ORDER BY<\/code> clause, the <code>PERCENT_RANK()<\/code> function will assign them the same rank.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='calculation-formula'>Calculation Formula <a href=\"#calculation-formula\" class=\"anchor\" id=\"calculation-formula\" title=\"Anchor for Calculation Formula\">#<\/a><\/h3>\n\n\n\n<p>PostgreSQL calculates the percent rank based on the following formula:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\">percent_rank = (rank - <span class=\"hljs-number\">1<\/span>) \/ (total_rows - <span class=\"hljs-number\">1<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>rank<\/strong>: The <a href=\"https:\/\/www.pgtutorial.com\/postgresql-window-functions\/postgresql-rank\/\">rank of the current row<\/a> within the partition.<\/li>\n\n\n\n<li><strong>total_rows<\/strong>: The total number of rows in the partition.<\/li>\n<\/ul>\n\n\n\n<p>The <code>PERCENT_RANK()<\/code> indicates the percentage of rows that fall below the current row&#8217;s value in the specified <code>ORDER BY<\/code> field.<\/p>\n\n\n\n<p>This function can be helpful when you want to understand the distribution of data points and compare individual values within a dataset.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='examples-of-postgresql-percent_rank-window-function'>Examples of PostgreSQL PERCENT_RANK() Window Function <a href=\"#examples-of-postgresql-percent_rank-window-function\" class=\"anchor\" id=\"examples-of-postgresql-percent_rank-window-function\" title=\"Anchor for Examples of PostgreSQL PERCENT_RANK() Window Function\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>PERCENT_RANK()<\/code> function with the <code>products<\/code> table:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"159\" height=\"254\" src=\"https:\/\/www.pgtutorial.com\/wp-content\/uploads\/2024\/12\/products.png\" alt=\"PostgreSQL PERCENT_RANK() Window Function\" class=\"wp-image-1051\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id='ranking-products-by-safety-stock'>Ranking Products by Safety Stock <a href=\"#ranking-products-by-safety-stock\" class=\"anchor\" id=\"ranking-products-by-safety-stock\" title=\"Anchor for Ranking Products by Safety Stock\">#<\/a><\/h3>\n\n\n\n<p>The following <code><a href=\"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-select\/\">SELECT<\/a><\/code> statement uses the <code>PERCENT_RANK()<\/code> window function to rank the products by their safety stocks from high to low:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  product_name,\n  safety_stock,\n  PERCENT_RANK() <span class=\"hljs-keyword\">OVER<\/span> (\n    <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n      safety_stock <span class=\"hljs-keyword\">DESC<\/span>\n  ) <span class=\"hljs-keyword\">AS<\/span> safety_stock_rank\n<span class=\"hljs-keyword\">FROM<\/span>\n  products;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIHByb2R1Y3RfbmFtZSwgc2FmZXR5X3N0b2NrLCBQRVJDRU5UX1JBTksoKSBPVkVSICggT1JERVIgQlkgc2FmZXR5X3N0b2NrIERFU0MgKSBBUyBzYWZldHlfc3RvY2tfcmFuayBGUk9NIHByb2R1Y3RzOw%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\">        product_name        | safety_stock |  safety_stock_rank\n<span class=\"hljs-comment\">----------------------------+--------------+----------------------<\/span>\n Samsung Galaxy Tab S9      |           <span class=\"hljs-number\">60<\/span> |                    <span class=\"hljs-number\">0<\/span>\n Apple iPhone <span class=\"hljs-number\">15<\/span> Pro Max    |           <span class=\"hljs-number\">50<\/span> | <span class=\"hljs-number\">0.041666666666666664<\/span>\n Apple AirPods Pro <span class=\"hljs-number\">3<\/span>        |           <span class=\"hljs-number\">45<\/span> |  <span class=\"hljs-number\">0.08333333333333333<\/span>\n Samsung QN900C Neo QLED    |           <span class=\"hljs-number\">40<\/span> |                <span class=\"hljs-number\">0.125<\/span>\n Sony Bravia XR A95K        |           <span class=\"hljs-number\">30<\/span> |  <span class=\"hljs-number\">0.16666666666666666<\/span>\n Huawei Mate <span class=\"hljs-number\">60<\/span>             |           <span class=\"hljs-number\">30<\/span> |  <span class=\"hljs-number\">0.16666666666666666<\/span>\n Samsung Galaxy Buds Pro <span class=\"hljs-number\">2<\/span>  |           <span class=\"hljs-number\">30<\/span> |  <span class=\"hljs-number\">0.16666666666666666<\/span>\n LG OLED TV C3              |           <span class=\"hljs-number\">20<\/span> |   <span class=\"hljs-number\">0.2916666666666667<\/span>\n Apple iPhone <span class=\"hljs-number\">15<\/span>            |           <span class=\"hljs-number\">20<\/span> |   <span class=\"hljs-number\">0.2916666666666667<\/span>\n Samsung Galaxy Z Fold <span class=\"hljs-number\">5<\/span>    |           <span class=\"hljs-number\">20<\/span> |   <span class=\"hljs-number\">0.2916666666666667<\/span>\n Apple Watch Series <span class=\"hljs-number\">9<\/span>       |           <span class=\"hljs-number\">20<\/span> |   <span class=\"hljs-number\">0.2916666666666667<\/span>\n Samsung Galaxy Watch <span class=\"hljs-number\">6<\/span>     |           <span class=\"hljs-number\">15<\/span> |   <span class=\"hljs-number\">0.4583333333333333<\/span>\n Apple iPad Pro <span class=\"hljs-number\">12.9<\/span>        |           <span class=\"hljs-number\">15<\/span> |   <span class=\"hljs-number\">0.4583333333333333<\/span>\n Samsung Galaxy S24         |           <span class=\"hljs-number\">10<\/span> |   <span class=\"hljs-number\">0.5416666666666666<\/span>\n Sony Xperia <span class=\"hljs-number\">1<\/span> VI           |           <span class=\"hljs-number\">10<\/span> |   <span class=\"hljs-number\">0.5416666666666666<\/span>\n LG G3 OLED                 |           <span class=\"hljs-number\">10<\/span> |   <span class=\"hljs-number\">0.5416666666666666<\/span>\n Dell Inspiron <span class=\"hljs-number\">27<\/span>           |            <span class=\"hljs-number\">0<\/span> |   <span class=\"hljs-number\">0.6666666666666666<\/span>\n Sony HT-A7000 Soundbar     |            <span class=\"hljs-number\">0<\/span> |   <span class=\"hljs-number\">0.6666666666666666<\/span>\n Bose SoundLink Max         |            <span class=\"hljs-number\">0<\/span> |   <span class=\"hljs-number\">0.6666666666666666<\/span>\n Dell XPS <span class=\"hljs-number\">15<\/span>                |            <span class=\"hljs-number\">0<\/span> |   <span class=\"hljs-number\">0.6666666666666666<\/span>\n HP Spectre x360            |            <span class=\"hljs-number\">0<\/span> |   <span class=\"hljs-number\">0.6666666666666666<\/span>\n Microsoft Surface Laptop <span class=\"hljs-number\">5<\/span> |            <span class=\"hljs-number\">0<\/span> |   <span class=\"hljs-number\">0.6666666666666666<\/span>\n Lenovo ThinkPad X1 Carbon  |            <span class=\"hljs-number\">0<\/span> |   <span class=\"hljs-number\">0.6666666666666666<\/span>\n Apple iMac <span class=\"hljs-number\">24<\/span>\"             |            0 |   0.6666666666666666\n Xiaomi Mi 14               |            0 |   0.6666666666666666<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <code>ORDER BY safety_stock DESC<\/code> clause orders the rows by safety stock in descending order.<\/li>\n\n\n\n<li>The <code>PERCENT_RANK()<\/code> function assigns a percent rank value to each row.<\/li>\n<\/ul>\n\n\n\n<p>To make the result more readable, you can cast the result into decimal numbers using the cast operator (<code>::<\/code>):<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  product_name,\n  safety_stock,\n  PERCENT_RANK() <span class=\"hljs-keyword\">OVER<\/span> (\n    <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n      safety_stock <span class=\"hljs-keyword\">DESC<\/span>\n  )::<span class=\"hljs-type\">DEC<\/span>(<span class=\"hljs-number\">3<\/span>,<span class=\"hljs-number\">2<\/span>) <span class=\"hljs-keyword\">AS<\/span> safety_stock_rank\n<span class=\"hljs-keyword\">FROM<\/span>\n  products;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIHByb2R1Y3RfbmFtZSwgc2FmZXR5X3N0b2NrLCBQRVJDRU5UX1JBTksoKSBPVkVSICggT1JERVIgQlkgc2FmZXR5X3N0b2NrIERFU0MgKTo6REVDKDMsMikgQVMgc2FmZXR5X3N0b2NrX3JhbmsgRlJPTSBwcm9kdWN0czs%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\">        product_name        | safety_stock | safety_stock_rank\n<span class=\"hljs-comment\">----------------------------+--------------+-------------------<\/span>\n Samsung Galaxy Tab S9      |           <span class=\"hljs-number\">60<\/span> |              <span class=\"hljs-number\">0.00<\/span>\n Apple iPhone <span class=\"hljs-number\">15<\/span> Pro Max    |           <span class=\"hljs-number\">50<\/span> |              <span class=\"hljs-number\">0.04<\/span>\n Apple AirPods Pro <span class=\"hljs-number\">3<\/span>        |           <span class=\"hljs-number\">45<\/span> |              <span class=\"hljs-number\">0.08<\/span>\n Samsung QN900C Neo QLED    |           <span class=\"hljs-number\">40<\/span> |              <span class=\"hljs-number\">0.13<\/span>\n Sony Bravia XR A95K        |           <span class=\"hljs-number\">30<\/span> |              <span class=\"hljs-number\">0.17<\/span>\n Huawei Mate <span class=\"hljs-number\">60<\/span>             |           <span class=\"hljs-number\">30<\/span> |              <span class=\"hljs-number\">0.17<\/span>\n Samsung Galaxy Buds Pro <span class=\"hljs-number\">2<\/span>  |           <span class=\"hljs-number\">30<\/span> |              <span class=\"hljs-number\">0.17<\/span>\n LG OLED TV C3              |           <span class=\"hljs-number\">20<\/span> |              <span class=\"hljs-number\">0.29<\/span>\n Apple iPhone <span class=\"hljs-number\">15<\/span>            |           <span class=\"hljs-number\">20<\/span> |              <span class=\"hljs-number\">0.29<\/span>\n Samsung Galaxy Z Fold <span class=\"hljs-number\">5<\/span>    |           <span class=\"hljs-number\">20<\/span> |              <span class=\"hljs-number\">0.29<\/span>\n Apple Watch Series <span class=\"hljs-number\">9<\/span>       |           <span class=\"hljs-number\">20<\/span> |              <span class=\"hljs-number\">0.29<\/span>\n Samsung Galaxy Watch <span class=\"hljs-number\">6<\/span>     |           <span class=\"hljs-number\">15<\/span> |              <span class=\"hljs-number\">0.46<\/span>\n Apple iPad Pro <span class=\"hljs-number\">12.9<\/span>        |           <span class=\"hljs-number\">15<\/span> |              <span class=\"hljs-number\">0.46<\/span>\n Samsung Galaxy S24         |           <span class=\"hljs-number\">10<\/span> |              <span class=\"hljs-number\">0.54<\/span>\n Sony Xperia <span class=\"hljs-number\">1<\/span> VI           |           <span class=\"hljs-number\">10<\/span> |              <span class=\"hljs-number\">0.54<\/span>\n LG G3 OLED                 |           <span class=\"hljs-number\">10<\/span> |              <span class=\"hljs-number\">0.54<\/span>\n Dell Inspiron <span class=\"hljs-number\">27<\/span>           |            <span class=\"hljs-number\">0<\/span> |              <span class=\"hljs-number\">0.67<\/span>\n Sony HT-A7000 Soundbar     |            <span class=\"hljs-number\">0<\/span> |              <span class=\"hljs-number\">0.67<\/span>\n Bose SoundLink Max         |            <span class=\"hljs-number\">0<\/span> |              <span class=\"hljs-number\">0.67<\/span>\n Dell XPS <span class=\"hljs-number\">15<\/span>                |            <span class=\"hljs-number\">0<\/span> |              <span class=\"hljs-number\">0.67<\/span>\n HP Spectre x360            |            <span class=\"hljs-number\">0<\/span> |              <span class=\"hljs-number\">0.67<\/span>\n Microsoft Surface Laptop <span class=\"hljs-number\">5<\/span> |            <span class=\"hljs-number\">0<\/span> |              <span class=\"hljs-number\">0.67<\/span>\n Lenovo ThinkPad X1 Carbon  |            <span class=\"hljs-number\">0<\/span> |              <span class=\"hljs-number\">0.67<\/span>\n Apple iMac <span class=\"hljs-number\">24<\/span>\"             |            0 |              0.67\n Xiaomi Mi 14               |            0 |              0.67<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='ranking-products-within-each-brand-by-safety-stock'>Ranking Products Within Each Brand by Safety Stock <a href=\"#ranking-products-within-each-brand-by-safety-stock\" class=\"anchor\" id=\"ranking-products-within-each-brand-by-safety-stock\" title=\"Anchor for Ranking Products Within Each Brand by Safety Stock\">#<\/a><\/h3>\n\n\n\n<p>The following <code><a href=\"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-select\/\">SELECT<\/a><\/code> statement uses the <code>PERCENT_RANK()<\/code> function to rank products within each brand by their safety stock in descending order:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  brand_id,\n  product_name,\n  safety_stock,\n  PERCENT_RANK() <span class=\"hljs-keyword\">OVER<\/span> (\n    <span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span>\n      brand_id\n    <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n      safety_stock <span class=\"hljs-keyword\">DESC<\/span>\n  )::<span class=\"hljs-type\">DEC<\/span>(<span class=\"hljs-number\">3<\/span>,<span class=\"hljs-number\">2<\/span>) <span class=\"hljs-keyword\">AS<\/span> safety_stock_rank\n<span class=\"hljs-keyword\">FROM<\/span>\n  products p;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIGJyYW5kX2lkLCBwcm9kdWN0X25hbWUsIHNhZmV0eV9zdG9jaywgUEVSQ0VOVF9SQU5LKCkgT1ZFUiAoIFBBUlRJVElPTiBCWSBicmFuZF9pZCBPUkRFUiBCWSBzYWZldHlfc3RvY2sgREVTQyApOjpERUMoMywyKSBBUyBzYWZldHlfc3RvY2tfcmFuayBGUk9NIHByb2R1Y3RzIHA7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"> brand_id |        product_name        | safety_stock | safety_stock_rank\n<span class=\"hljs-comment\">----------+----------------------------+--------------+-------------------<\/span>\n        <span class=\"hljs-number\">1<\/span> | Samsung Galaxy Tab S9      |           <span class=\"hljs-number\">60<\/span> |              <span class=\"hljs-number\">0.00<\/span>\n        <span class=\"hljs-number\">1<\/span> | Samsung QN900C Neo QLED    |           <span class=\"hljs-number\">40<\/span> |              <span class=\"hljs-number\">0.20<\/span>\n        <span class=\"hljs-number\">1<\/span> | Samsung Galaxy Buds Pro <span class=\"hljs-number\">2<\/span>  |           <span class=\"hljs-number\">30<\/span> |              <span class=\"hljs-number\">0.40<\/span>\n        <span class=\"hljs-number\">1<\/span> | Samsung Galaxy Z Fold <span class=\"hljs-number\">5<\/span>    |           <span class=\"hljs-number\">20<\/span> |              <span class=\"hljs-number\">0.60<\/span>\n        <span class=\"hljs-number\">1<\/span> | Samsung Galaxy Watch <span class=\"hljs-number\">6<\/span>     |           <span class=\"hljs-number\">15<\/span> |              <span class=\"hljs-number\">0.80<\/span>\n        <span class=\"hljs-number\">1<\/span> | Samsung Galaxy S24         |           <span class=\"hljs-number\">10<\/span> |              <span class=\"hljs-number\">1.00<\/span>\n        <span class=\"hljs-number\">2<\/span> | Apple iPhone <span class=\"hljs-number\">15<\/span> Pro Max    |           <span class=\"hljs-number\">50<\/span> |              <span class=\"hljs-number\">0.00<\/span>\n        <span class=\"hljs-number\">2<\/span> | Apple AirPods Pro <span class=\"hljs-number\">3<\/span>        |           <span class=\"hljs-number\">45<\/span> |              <span class=\"hljs-number\">0.20<\/span>\n        <span class=\"hljs-number\">2<\/span> | Apple iPhone <span class=\"hljs-number\">15<\/span>            |           <span class=\"hljs-number\">20<\/span> |              <span class=\"hljs-number\">0.40<\/span>\n        <span class=\"hljs-number\">2<\/span> | Apple Watch Series <span class=\"hljs-number\">9<\/span>       |           <span class=\"hljs-number\">20<\/span> |              <span class=\"hljs-number\">0.40<\/span>\n        <span class=\"hljs-number\">2<\/span> | Apple iPad Pro <span class=\"hljs-number\">12.9<\/span>        |           <span class=\"hljs-number\">15<\/span> |              <span class=\"hljs-number\">0.80<\/span>\n        <span class=\"hljs-number\">2<\/span> | Apple iMac <span class=\"hljs-number\">24<\/span>\"             |            0 |              1.00\n        3 | Huawei Mate 60             |           30 |              0.00\n        4 | Xiaomi Mi 14               |            0 |              0.00\n        5 | Sony Bravia XR A95K        |           30 |              0.00\n        5 | Sony Xperia 1 VI           |           10 |              0.50\n        5 | Sony HT-A7000 Soundbar     |            0 |              1.00\n        6 | LG G3 OLED                 |           10 |              0.00\n        7 | LG OLED TV C3              |           20 |              0.00\n        7 | Dell Inspiron 27           |            0 |              0.33\n        7 | Bose SoundLink Max         |            0 |              0.33\n        7 | Dell XPS 15                |            0 |              0.33\n        8 | HP Spectre x360            |            0 |              0.00\n        9 | Microsoft Surface Laptop 5 |            0 |              0.00\n       10 | Lenovo ThinkPad X1 Carbon  |            0 |              0.00<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this query:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <code>PARTITION BY brand_id<\/code> clause divides the result set into partitions by <code>brand_id<\/code>.<\/li>\n\n\n\n<li>The <code>ORDER BY safety_stock DESC<\/code> clause orders the rows within each partition by safety stock in descending order.<\/li>\n<\/ul>\n\n\n\n<p>To retrieve the brand name, you can join the <code>products<\/code> table with the <code>brands<\/code> table:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"378\" height=\"254\" src=\"https:\/\/www.pgtutorial.com\/wp-content\/uploads\/2024\/12\/products-brands-1.png\" alt=\"\" class=\"wp-image-1048\" srcset=\"https:\/\/www.pgtutorial.com\/wp-content\/uploads\/2024\/12\/products-brands-1.png 378w, https:\/\/www.pgtutorial.com\/wp-content\/uploads\/2024\/12\/products-brands-1-300x202.png 300w\" sizes=\"auto, (max-width: 378px) 100vw, 378px\" \/><\/figure>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  brand_name,\n  product_name,\n  safety_stock,\n  PERCENT_RANK() <span class=\"hljs-keyword\">OVER<\/span> (\n    <span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span>\n      brand_name\n    <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n      safety_stock <span class=\"hljs-keyword\">DESC<\/span>\n  )::<span class=\"hljs-type\">DEC<\/span>(<span class=\"hljs-number\">3<\/span>,<span class=\"hljs-number\">2<\/span>) <span class=\"hljs-keyword\">AS<\/span> safety_stock_rank\n<span class=\"hljs-keyword\">FROM<\/span>\n  products\n  <span class=\"hljs-keyword\">JOIN<\/span> brands <span class=\"hljs-keyword\">USING<\/span> (brand_id);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIGJyYW5kX25hbWUsIHByb2R1Y3RfbmFtZSwgc2FmZXR5X3N0b2NrLCBQRVJDRU5UX1JBTksoKSBPVkVSICggUEFSVElUSU9OIEJZIGJyYW5kX25hbWUgT1JERVIgQlkgc2FmZXR5X3N0b2NrIERFU0MgKTo6REVDKDMsMikgQVMgc2FmZXR5X3N0b2NrX3JhbmsgRlJPTSBwcm9kdWN0cyBKT0lOIGJyYW5kcyBVU0lORyAoYnJhbmRfaWQpOw%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"> brand_name |        product_name        | safety_stock | safety_stock_rank\n<span class=\"hljs-comment\">------------+----------------------------+--------------+-------------------<\/span>\n Apple      | Apple iPhone <span class=\"hljs-number\">15<\/span> Pro Max    |           <span class=\"hljs-number\">50<\/span> |              <span class=\"hljs-number\">0.00<\/span>\n Apple      | Apple AirPods Pro <span class=\"hljs-number\">3<\/span>        |           <span class=\"hljs-number\">45<\/span> |              <span class=\"hljs-number\">0.20<\/span>\n Apple      | Apple iPhone <span class=\"hljs-number\">15<\/span>            |           <span class=\"hljs-number\">20<\/span> |              <span class=\"hljs-number\">0.40<\/span>\n Apple      | Apple Watch Series <span class=\"hljs-number\">9<\/span>       |           <span class=\"hljs-number\">20<\/span> |              <span class=\"hljs-number\">0.40<\/span>\n Apple      | Apple iPad Pro <span class=\"hljs-number\">12.9<\/span>        |           <span class=\"hljs-number\">15<\/span> |              <span class=\"hljs-number\">0.80<\/span>\n Apple      | Apple iMac <span class=\"hljs-number\">24<\/span>\"             |            0 |              1.00\n Dell       | LG OLED TV C3              |           20 |              0.00\n Dell       | Bose SoundLink Max         |            0 |              0.33\n Dell       | Dell Inspiron 27           |            0 |              0.33\n Dell       | Dell XPS 15                |            0 |              0.33\n HP         | HP Spectre x360            |            0 |              0.00\n Huawei     | Huawei Mate 60             |           30 |              0.00\n Lenovo     | Lenovo ThinkPad X1 Carbon  |            0 |              0.00\n LG         | LG G3 OLED                 |           10 |              0.00\n Microsoft  | Microsoft Surface Laptop 5 |            0 |              0.00\n Samsung    | Samsung Galaxy Tab S9      |           60 |              0.00\n Samsung    | Samsung QN900C Neo QLED    |           40 |              0.20\n Samsung    | Samsung Galaxy Buds Pro 2  |           30 |              0.40\n Samsung    | Samsung Galaxy Z Fold 5    |           20 |              0.60\n Samsung    | Samsung Galaxy Watch 6     |           15 |              0.80\n Samsung    | Samsung Galaxy S24         |           10 |              1.00\n Sony       | Sony Bravia XR A95K        |           30 |              0.00\n Sony       | Sony Xperia 1 VI           |           10 |              0.50\n Sony       | Sony HT-A7000 Soundbar     |            0 |              1.00\n Xiaomi     | Xiaomi Mi 14               |            0 |              0.00<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <code>PARTITION BY brand_name<\/code> clause divides the result set into partitions by brand name.<\/li>\n\n\n\n<li>The <code>ORDER BY safety_stock DESC<\/code> clause sorts the rows within each partition by safety stock in descending order.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the PostgreSQL <code>PERCENT_RANK()<\/code> function to assign a relative rank value to each row within a partition of a result set. <\/li>\n\n\n\n<li>The first value always has a rank of 0. Except for the first row, rows with the same values will receive the same percent rank.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='quiz'>Quiz <a href=\"#quiz\" class=\"anchor\" id=\"quiz\" title=\"Anchor for Quiz\">#<\/a><\/h2>\n\n\n\n<iframe loading=\"lazy\"\n  name=\"quiz\"\n  src=\"\/quiz\/?quiz=percent_rank\"\n  height=\"700\"\n  width=\"600\"\n  class=\"iframe\"\n><\/iframe>\n\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful ?<\/div>\n\t\t<div class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"1106\"\n\t\t\t\tdata-post-url=\"https:\/\/www.pgtutorial.com\/postgresql-window-functions\/postgresql-percent_rank\/\"\n\t\t\t\tdata-post-title=\"PostgreSQL PERCENT_RANK Window Function\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded wth-yes-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t\tclass=\"feather feather-thumbs-up block w-full h-full\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M14 9V5a3 3 0 0 0-3-3l-4 9v11h11.28a2 2 0 0 0 2-1.7l1.38-9a2 2 0 0 0-2-2.3zM7 22H4a2 2 0 0 1-2-2v-7a2 2 0 0 1 2-2h3\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> Yes <\/span>\n\t\t\t<\/button>\n\n\t\t\t<button\n\t\t\t\tdata-response=\"0\"\n\t\t\t\tdata-post=\"1106\"\n\t\t\t\tdata-post-url=\"https:\/\/www.pgtutorial.com\/postgresql-window-functions\/postgresql-percent_rank\/\"\n\t\t\t\tdata-post-title=\"PostgreSQL PERCENT_RANK Window Function\"\n\t\t\t\tclass=\"wth-btn-rounded wth-no-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M10 15v4a3 3 0 0 0 3 3l4-9V2H5.72a2 2 0 0 0-2 1.7l-1.38 9a2 2 0 0 0 2 2.3zm7-13h2.67A2.31 2.31 0 0 1 22 4v7a2.31 2.31 0 0 1-2.33 2H17\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> No <\/span>\n\t\t\t<\/button>\n\t\t<\/div>\n\t<\/header>\n\n\t<div class=\"wth-form hidden\">\n\t\t<div class=\"wth-form-wrapper\">\n\t\t\t<div class=\"wth-title\"><\/div>\n\t\t\t\n\t\t\t<textarea class=\"wth-message\"><\/textarea>\n\n\t\t\t<button class=\"btn btn-primary wth-btn-submit\">Send<\/button>\n\t\t\t<button class=\"btn wth-btn-cancel\">Cancel<\/button>\n\t\t\n\t\t<\/div>\n\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Summary: In this tutorial, you&#8217;ll learn how to use the PostgreSQL PERCENT_RANK() function to calculate a relative rank of a value in a set of values. Getting Started with the PostgreSQL PERCENT_RANK() Window Function # The PERCENT_RANK() function assigns a relative rank value to each row within a partition based on the values of one [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1072,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1106","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PostgreSQL PERCENT_RANK Window Function<\/title>\n<meta name=\"description\" content=\"In this tutorial, you&#039;ll learn how to use the PostgreSQL PERCENT_RANK() function to calculate a relative rank of a value in a set of values.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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