{"id":1087,"date":"2024-12-20T08:18:43","date_gmt":"2024-12-20T01:18:43","guid":{"rendered":"https:\/\/www.pgtutorial.com\/?page_id=1087"},"modified":"2025-01-05T20:17:47","modified_gmt":"2025-01-05T13:17:47","slug":"postgresql-rank","status":"publish","type":"page","link":"https:\/\/www.pgtutorial.com\/postgresql-window-functions\/postgresql-rank\/","title":{"rendered":"PostgreSQL RANK Window Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn how to use the PostgreSQL <code>RANK()<\/code> function to assign a rank value to each row within a partition of a result set.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='getting-started-with-the-postgresql-rank-window-function'>Getting Started with the PostgreSQL RANK Window Function <a href=\"#getting-started-with-the-postgresql-rank-window-function\" class=\"anchor\" id=\"getting-started-with-the-postgresql-rank-window-function\" title=\"Anchor for Getting Started with the PostgreSQL RANK Window Function\">#<\/a><\/h2>\n\n\n\n<p>The <code>RANK()<\/code> function assigns a rank value to each row within a partition of a result set based on the values of one or more columns.<\/p>\n\n\n\n<p>The <code>RANK()<\/code> function reliably assigns the same rank values if the rows have the same values, ensuring predictability in your results.<\/p>\n\n\n\n<p>Since some rows will receive the same rank values, the subsequent rows may have gaps in the ranking sequence.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>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\">RANK() <span class=\"hljs-keyword\">OVER<\/span> (\n    &#91;<span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span> partition_expresion]\n    &#91;<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> sort_expression]\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>RANK()<\/code> function applies. The <code>partition_expression<\/code> can be one or more columns you want to use to divide the result set.<\/li>\n\n\n\n<li><code>ORDER BY<\/code> determines the order of rows within each partition based on the <code>sort_expression<\/code>. The <code>RANK()<\/code> function uses the columns listed in the <code>sort_expresion<\/code> of the <code>ORDER BY<\/code> clause to assign the rank values.<\/li>\n<\/ul>\n\n\n\n<p>Both <code>PARTITION BY<\/code> and <code>ORDER BY<\/code> clauses are optional. If you omit these clauses, the <code>RANK()<\/code> function will treat all the rows as peers and assign them the same rank (<code>1<\/code>).<\/p>\n\n\n\n<p>Therefore, the <code>RANK()<\/code> function works properly only when you have at least the <code>ORDER BY<\/code> clause. The <code>RANK()<\/code> function needs the order of the rows before applying the ranking.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='postgresql-rank-function-examples'>PostgreSQL RANK function examples <a href=\"#postgresql-rank-function-examples\" class=\"anchor\" id=\"postgresql-rank-function-examples\" title=\"Anchor for PostgreSQL RANK function examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s explore examples of using the <code>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 RANK Window Function - Sample Table\" 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 statement uses the <code>RANK()<\/code> window function to rank the products by their safety stocks in descending order:<\/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\"><span class=\"hljs-keyword\">SELECT<\/span>\n    product_name,\n    safety_stock,\n    RANK() <span class=\"hljs-keyword\">OVER<\/span> (\n       <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> 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-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><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIHByb2R1Y3RfbmFtZSwgc2FmZXR5X3N0b2NrLCBSQU5LKCkgT1ZFUiAoIE9SREVSIEJZIHNhZmV0eV9zdG9jayBERVNDICkgQVMgc2FmZXR5X3N0b2NrX3JhbmsgRlJPTSBwcm9kdWN0czs%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-3\" 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\">1<\/span>\n Apple iPhone <span class=\"hljs-number\">15<\/span> Pro Max    |           <span class=\"hljs-number\">50<\/span> |                 <span class=\"hljs-number\">2<\/span>\n Apple AirPods Pro <span class=\"hljs-number\">3<\/span>        |           <span class=\"hljs-number\">45<\/span> |                 <span class=\"hljs-number\">3<\/span>\n Samsung QN900C Neo QLED    |           <span class=\"hljs-number\">40<\/span> |                 <span class=\"hljs-number\">4<\/span>\n Sony Bravia XR A95K        |           <span class=\"hljs-number\">30<\/span> |                 <span class=\"hljs-number\">5<\/span>\n Huawei Mate <span class=\"hljs-number\">60<\/span>             |           <span class=\"hljs-number\">30<\/span> |                 <span class=\"hljs-number\">5<\/span>\n Samsung Galaxy Buds Pro <span class=\"hljs-number\">2<\/span>  |           <span class=\"hljs-number\">30<\/span> |                 <span class=\"hljs-number\">5<\/span>\n LG OLED TV C3              |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">8<\/span>\n...<\/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>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>RANK()<\/code> function assigns a rank value to each row.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id='ranking-products-within-each-category-by-safety-stock'>Ranking Products Within Each Category by Safety Stock <a href=\"#ranking-products-within-each-category-by-safety-stock\" class=\"anchor\" id=\"ranking-products-within-each-category-by-safety-stock\" title=\"Anchor for Ranking Products Within Each Category by Safety Stock\">#<\/a><\/h3>\n\n\n\n<p>The following example ranks products within each category by their safety stock in descending order.<\/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\"><span class=\"hljs-keyword\">SELECT<\/span>\n  category_id,\n  product_name,\n  safety_stock,\n  RANK() <span class=\"hljs-keyword\">OVER<\/span> (\n    <span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span> category_id\n    <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> safety_stock <span class=\"hljs-keyword\">DESC<\/span>\n  ) <span class=\"hljs-keyword\">AS<\/span> rank\n<span class=\"hljs-keyword\">FROM<\/span>\n  products p;<\/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><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIGNhdGVnb3J5X2lkLCBwcm9kdWN0X25hbWUsIHNhZmV0eV9zdG9jaywgUkFOSygpIE9WRVIgKCBQQVJUSVRJT04gQlkgY2F0ZWdvcnlfaWQgT1JERVIgQlkgc2FmZXR5X3N0b2NrIERFU0MgKSBBUyByYW5rIEZST00gcHJvZHVjdHMgcDs%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-5\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"> category_id |        product_name        | safety_stock | rank\n<span class=\"hljs-comment\">-------------+----------------------------+--------------+------<\/span>\n           <span class=\"hljs-number\">3<\/span> | Apple iPhone <span class=\"hljs-number\">15<\/span> Pro Max    |           <span class=\"hljs-number\">50<\/span> |    <span class=\"hljs-number\">1<\/span>\n           <span class=\"hljs-number\">3<\/span> | Huawei Mate <span class=\"hljs-number\">60<\/span>             |           <span class=\"hljs-number\">30<\/span> |    <span class=\"hljs-number\">2<\/span>\n           <span class=\"hljs-number\">3<\/span> | Apple iPhone <span class=\"hljs-number\">15<\/span>            |           <span class=\"hljs-number\">20<\/span> |    <span class=\"hljs-number\">3<\/span>\n           <span class=\"hljs-number\">3<\/span> | Samsung Galaxy Z Fold <span class=\"hljs-number\">5<\/span>    |           <span class=\"hljs-number\">20<\/span> |    <span class=\"hljs-number\">3<\/span>\n           <span class=\"hljs-number\">3<\/span> | Samsung Galaxy S24         |           <span class=\"hljs-number\">10<\/span> |    <span class=\"hljs-number\">5<\/span>\n           <span class=\"hljs-number\">3<\/span> | Sony Xperia <span class=\"hljs-number\">1<\/span> VI           |           <span class=\"hljs-number\">10<\/span> |    <span class=\"hljs-number\">5<\/span>\n           <span class=\"hljs-number\">3<\/span> | Xiaomi Mi <span class=\"hljs-number\">14<\/span>               |            <span class=\"hljs-number\">0<\/span> |    <span class=\"hljs-number\">7<\/span>\n           <span class=\"hljs-number\">4<\/span> | Samsung Galaxy Tab S9      |           <span class=\"hljs-number\">60<\/span> |    <span class=\"hljs-number\">1<\/span>\n           <span class=\"hljs-number\">4<\/span> | Apple iPad Pro <span class=\"hljs-number\">12.9<\/span>        |           <span class=\"hljs-number\">15<\/span> |    <span class=\"hljs-number\">2<\/span>\n...<\/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>In this query:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <code>PARTITION BY category_id<\/code> clause divides the result set into partitions by <code>category_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 category name, you can join the <code>products<\/code> table with the <code>categories<\/code> table:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"415\" height=\"254\" src=\"https:\/\/www.pgtutorial.com\/wp-content\/uploads\/2024\/12\/products-categories-1.png\" alt=\"PostgreSQL RANK Window Function - Sample Tables\" class=\"wp-image-1049\" srcset=\"https:\/\/www.pgtutorial.com\/wp-content\/uploads\/2024\/12\/products-categories-1.png 415w, https:\/\/www.pgtutorial.com\/wp-content\/uploads\/2024\/12\/products-categories-1-300x184.png 300w\" sizes=\"auto, (max-width: 415px) 100vw, 415px\" \/><\/figure>\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\"><span class=\"hljs-keyword\">SELECT<\/span>\n  category_name,\n  product_name,\n  safety_stock,\n  RANK() <span class=\"hljs-keyword\">OVER<\/span> (\n    <span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span> category_name\n    <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> safety_stock <span class=\"hljs-keyword\">DESC<\/span>\n  ) <span class=\"hljs-keyword\">AS<\/span> rank\n<span class=\"hljs-keyword\">FROM<\/span>\n  products p\n  <span class=\"hljs-keyword\">JOIN<\/span> categories <span class=\"hljs-keyword\">USING<\/span> (category_id);<\/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<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIGNhdGVnb3J5X25hbWUsIHByb2R1Y3RfbmFtZSwgc2FmZXR5X3N0b2NrLCBSQU5LKCkgT1ZFUiAoIFBBUlRJVElPTiBCWSBjYXRlZ29yeV9uYW1lIE9SREVSIEJZIHNhZmV0eV9zdG9jayBERVNDICkgQVMgcmFuayBGUk9NIHByb2R1Y3RzIHAgSk9JTiBjYXRlZ29yaWVzIFVTSU5HIChjYXRlZ29yeV9pZCk7\" 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-7\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\">category_name |        product_name        | safety_stock | rank\n<span class=\"hljs-comment\">---------------+----------------------------+--------------+------<\/span>\n Accessories   | Apple AirPods Pro <span class=\"hljs-number\">3<\/span>        |           <span class=\"hljs-number\">45<\/span> |    <span class=\"hljs-number\">1<\/span>\n Accessories   | Samsung Galaxy Buds Pro <span class=\"hljs-number\">2<\/span>  |           <span class=\"hljs-number\">30<\/span> |    <span class=\"hljs-number\">2<\/span>\n Audio Systems | Bose SoundLink Max         |            <span class=\"hljs-number\">0<\/span> |    <span class=\"hljs-number\">1<\/span>\n Audio Systems | Sony HT-A7000 Soundbar     |            <span class=\"hljs-number\">0<\/span> |    <span class=\"hljs-number\">1<\/span>\n Desktops      | Apple iMac <span class=\"hljs-number\">24<\/span>\"             |            0 |    1\n Desktops      | Dell Inspiron 27           |            0 |    1\n Laptops       | Microsoft Surface Laptop 5 |            0 |    1\n Laptops       | Dell XPS 15                |            0 |    1\n Laptops       | Lenovo ThinkPad X1 Carbon  |            0 |    1\n Laptops       | HP Spectre x360            |            0 |    1\n Smartphones   | Apple iPhone 15 Pro Max    |           50 |    1\n Smartphones   | Huawei Mate 60             |           30 |    2\n Smartphones   | Apple iPhone 15            |           20 |    3\n...<\/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>In this example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <code>PARTITION BY category_name<\/code> clause divides the result set into partitions by <code>category_name<\/code>.<\/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>RANK()<\/code> function to assign a rank value to each row within a partition of a result set.<\/li>\n\n\n\n<li>The <code>RANK()<\/code> function assigns the same rank values to the rows with the same values.<\/li>\n\n\n\n<li>The <code>RANK()<\/code> function may create gaps for subsequent rows.<\/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=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=\"1087\"\n\t\t\t\tdata-post-url=\"https:\/\/www.pgtutorial.com\/postgresql-window-functions\/postgresql-rank\/\"\n\t\t\t\tdata-post-title=\"PostgreSQL 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 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within a partition of a result set. Getting Started with the PostgreSQL RANK Window Function # The RANK() function assigns a rank value to each row within a partition of a result set based [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1072,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1087","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 RANK Window Function<\/title>\n<meta name=\"description\" content=\"You&#039;ll learn how to use the PostgreSQL RANK() function to assign a rank value to each row within a partition of a result set.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pgtutorial.com\/postgresql-window-functions\/postgresql-rank\/\" 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