{"id":1098,"date":"2024-12-20T09:05:02","date_gmt":"2024-12-20T02:05:02","guid":{"rendered":"https:\/\/www.pgtutorial.com\/?page_id=1098"},"modified":"2025-01-05T20:20:35","modified_gmt":"2025-01-05T13:20:35","slug":"postgresql-dense_rank","status":"publish","type":"page","link":"https:\/\/www.pgtutorial.com\/postgresql-window-functions\/postgresql-dense_rank\/","title":{"rendered":"PostgreSQL DENSE_RANK Window Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn how to use the PostgreSQL <code>DENSE_RANK()<\/code> function to assign a rank value, without gaps, 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-dense_rank-window-function'>Getting Started with the PostgreSQL DENSE_RANK window function <a href=\"#getting-started-with-the-postgresql-dense_rank-window-function\" class=\"anchor\" id=\"getting-started-with-the-postgresql-dense_rank-window-function\" title=\"Anchor for Getting Started with the PostgreSQL DENSE_RANK window function\">#<\/a><\/h2>\n\n\n\n<p>The <code>DENSE_RANK()<\/code> function assigns a rank value to each row within a partition based on the values of one or more columns. It reliably assigns the same rank values if the rows have the same values.<\/p>\n\n\n\n<p>Unlike the <code><a href=\"https:\/\/www.pgtutorial.com\/postgresql-window-functions\/postgresql-rank\/\">RANK()<\/a><\/code> function, which creates gaps in the ranking sequence, the <code>DENSE_RANK()<\/code> function does not.<\/p>\n\n\n\n<p>Here\u2019s the syntax of the <code>DENSE_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\">DENSE_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>DENSE_RANK()<\/code> function applies.<\/li>\n\n\n\n<li><code>ORDER BY<\/code>: Sorts rows within each partition. The values of the columns listed in the <code>DENSE_RANK()<\/code> function will determine rank values.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='postgresql-dense_rank-function-examples'>PostgreSQL DENSE_RANK Function Examples <a href=\"#postgresql-dense_rank-function-examples\" class=\"anchor\" id=\"postgresql-dense_rank-function-examples\" title=\"Anchor for PostgreSQL DENSE_RANK Function Examples\">#<\/a><\/h2>\n\n\n\n<p>Let\u2019s take some examples of using the <code>DENSE_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=\"row_number function with products 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>DENSE_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-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    DENSE_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=U0VMRUNUIHByb2R1Y3RfbmFtZSwgc2FmZXR5X3N0b2NrLCBERU5TRV9SQU5LKCkgT1ZFUiAoIE9SREVSIEJZIHNhZmV0eV9zdG9jayBERVNDICkgQVMgc2FmZXR5X3N0b2NrX3JhbmsgRlJPTSBwcm9kdWN0czs%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\">6<\/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 from high to low.<\/li>\n\n\n\n<li>The <code>DENSE_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-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 example ranks products within each brand 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  brand_id,\n  product_name,\n  safety_stock,\n  DENSE_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-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-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=U0VMRUNUIGJyYW5kX2lkLCBwcm9kdWN0X25hbWUsIHNhZmV0eV9zdG9jaywgREVOU0VfUkFOSygpIE9WRVIgKCBQQVJUSVRJT04gQlkgYnJhbmRfaWQgT1JERVIgQlkgc2FmZXR5X3N0b2NrIERFU0MgKSBBUyBzYWZldHlfc3RvY2tfcmFuayBGUk9NIHByb2R1Y3RzIHA7\" 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\"> 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\">1<\/span>\n        <span class=\"hljs-number\">1<\/span> | Samsung QN900C Neo QLED    |           <span class=\"hljs-number\">40<\/span> |                 <span class=\"hljs-number\">2<\/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\">3<\/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\">4<\/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\">5<\/span>\n        <span class=\"hljs-number\">1<\/span> | Samsung Galaxy S24         |           <span class=\"hljs-number\">10<\/span> |                 <span class=\"hljs-number\">6<\/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\">1<\/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\">2<\/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\">3<\/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\">3<\/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\">4<\/span>\n        <span class=\"hljs-number\">2<\/span> | Apple iMac <span class=\"hljs-number\">24<\/span>\"             |            0 |                 5\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 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<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    brand_name,\n    product_name,\n    safety_stock,\n    DENSE_RANK() <span class=\"hljs-keyword\">OVER<\/span> (\n        <span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span> brand_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> safety_stock_rank\n<span class=\"hljs-keyword\">FROM<\/span>\n    products p\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-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=U0VMRUNUIGNhdGVnb3J5X25hbWUsIHByb2R1Y3RfbmFtZSwgc2FmZXR5X3N0b2NrLCBERU5TRV9SQU5LKCkgT1ZFUiAoIFBBUlRJVElPTiBCWSBjYXRlZ29yeV9uYW1lIE9SREVSIEJZIHNhZmV0eV9zdG9jayBERVNDICkgQVMgc2FmZXR5X3N0b2NrX3JhbmsgRlJPTSBwcm9kdWN0cyBwIEpPSU4gY2F0ZWdvcmllcyBVU0lORyAoY2F0ZWdvcnlfaWQpOw%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-7\" 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\">1<\/span>\n Apple      | Apple AirPods Pro <span class=\"hljs-number\">3<\/span>        |           <span class=\"hljs-number\">45<\/span> |                 <span class=\"hljs-number\">2<\/span>\n Apple      | Apple iPhone <span class=\"hljs-number\">15<\/span>            |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">3<\/span>\n Apple      | Apple Watch Series <span class=\"hljs-number\">9<\/span>       |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">3<\/span>\n Apple      | Apple iPad Pro <span class=\"hljs-number\">12.9<\/span>        |           <span class=\"hljs-number\">15<\/span> |                 <span class=\"hljs-number\">4<\/span>\n Apple      | Apple iMac <span class=\"hljs-number\">24<\/span>\"             |            0 |                 5\n Dell       | LG OLED TV C3              |           20 |                 1\n Dell       | Bose SoundLink Max         |            0 |                 2\n Dell       | Dell Inspiron 27           |            0 |                 2\n Dell       | Dell XPS 15                |            0 |                 2\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>DENSE_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>DENSE_RANK()<\/code> function assigns the same rank values to the rows with the same values and does not 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=dense_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 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