{"id":6971,"date":"2018-08-25T07:36:54","date_gmt":"2018-08-25T14:36:54","guid":{"rendered":"http:\/\/www.mysqltutorial.org\/?page_id=6971"},"modified":"2024-01-04T04:02:00","modified_gmt":"2024-01-04T11:02:00","slug":"mysql-dense_rank-function","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-window-functions\/mysql-dense_rank-function\/","title":{"rendered":"MySQL DENSE_RANK Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn about the MySQL <code>DENSE_RANK()<\/code> function and how to apply it to find the rank of rows in a partition or result set.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to MySQL DENSE_RANK function<\/h2>\n\n\n\n<p>The <code>DENSE_RANK()<\/code> is a <a href=\"https:\/\/www.mysqltutorial.org\/mysql-window-functions\/\">window function<\/a> that assigns a rank to each row within a partition or result set with no gaps in ranking values.<\/p>\n\n\n\n<p>The rank of a row is increased by one from the number of distinct rank values that come before the row.<\/p>\n\n\n\n<p>Here&#8217;s the basic syntax of the <code>DENSE_RANK()<\/code>\u00a0function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">DENSE_RANK() OVER (\n    PARTITION BY partition_expression\n    ORDER BY sort_expression &#91;ASC|DESC]\n)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/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>First, the <code>PARTITION BY<\/code> clause divides the result sets produced by the <code>FROM<\/code> clause into partitions. The <code>DENSE_RANK()<\/code> function is applied to each partition independently.<\/li>\n\n\n\n<li>Second, the <code>ORDER BY<\/code>&nbsp; clause specifies the order of rows in each partition on which the <code>DENSE_RANK()<\/code> function operates.<\/li>\n<\/ul>\n\n\n\n<p>If a partition has two or more rows with the same rank value, each of these rows will be assigned the same rank.<\/p>\n\n\n\n<p>Unlike the <code><a href=\"https:\/\/www.mysqltutorial.org\/mysql-window-functions\/mysql-rank-function\/\">RANK()<\/a><\/code> function, the <code>DENSE_RANK()<\/code> function always returns consecutive rank values.<\/p>\n\n\n\n<p>Suppose you have a table <code>t<\/code> with some sample data as follows:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> t (\n    val <span class=\"hljs-built_in\">INT<\/span>\n);\n\n<span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> t(val)\n<span class=\"hljs-keyword\">VALUES<\/span>(<span class=\"hljs-number\">1<\/span>),(<span class=\"hljs-number\">2<\/span>),(<span class=\"hljs-number\">2<\/span>),(<span class=\"hljs-number\">3<\/span>),(<span class=\"hljs-number\">4<\/span>),(<span class=\"hljs-number\">4<\/span>),(<span class=\"hljs-number\">5<\/span>);\n\n\n<span class=\"hljs-keyword\">SELECT<\/span> * <span class=\"hljs-keyword\">FROM<\/span> t;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">+------+\r\n| val  |\r\n+------+\r\n|    <span class=\"hljs-number\">1<\/span> |\r\n|    <span class=\"hljs-number\">2<\/span> |\r\n|    <span class=\"hljs-number\">2<\/span> |\r\n|    <span class=\"hljs-number\">3<\/span> |\r\n|    <span class=\"hljs-number\">4<\/span> |\r\n|    <span class=\"hljs-number\">4<\/span> |\r\n|    <span class=\"hljs-number\">5<\/span> |\r\n+------+\r\n<span class=\"hljs-number\">7<\/span> rows <span class=\"hljs-keyword\">in<\/span> <span class=\"hljs-keyword\">set<\/span> (0.00 sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The following statement uses the <code>DENSE_RANK()<\/code> function to assign a rank to each row:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n    val,\n    <span class=\"hljs-keyword\">DENSE_RANK<\/span>() <span class=\"hljs-keyword\">OVER<\/span> (\n        <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> val\n    ) my_rank\n<span class=\"hljs-keyword\">FROM<\/span> t;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Here is the output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">+------+---------+\r\n| val  | my_rank |\r\n+------+---------+\r\n|    <span class=\"hljs-number\">1<\/span> |       <span class=\"hljs-number\">1<\/span> |\r\n|    <span class=\"hljs-number\">2<\/span> |       <span class=\"hljs-number\">2<\/span> |\r\n|    <span class=\"hljs-number\">2<\/span> |       <span class=\"hljs-number\">2<\/span> |\r\n|    <span class=\"hljs-number\">3<\/span> |       <span class=\"hljs-number\">3<\/span> |\r\n|    <span class=\"hljs-number\">4<\/span> |       <span class=\"hljs-number\">4<\/span> |\r\n|    <span class=\"hljs-number\">4<\/span> |       <span class=\"hljs-number\">4<\/span> |\r\n|    <span class=\"hljs-number\">5<\/span> |       <span class=\"hljs-number\">5<\/span> |\r\n+------+---------+\r\n<span class=\"hljs-number\">7<\/span> rows <span class=\"hljs-keyword\">in<\/span> <span class=\"hljs-keyword\">set<\/span> (0.01 sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\">MySQL DENSE_RANK() function example<\/h2>\n\n\n\n<p>We will use the following <code>sales<\/code> table for the demonstration:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">CREATE TABLE sales(\r\n    sales_employee VARCHAR(<span class=\"hljs-number\">50<\/span>) NOT <span class=\"hljs-keyword\">NULL<\/span>,\r\n    fiscal_year INT NOT <span class=\"hljs-keyword\">NULL<\/span>,\r\n    sale DECIMAL(<span class=\"hljs-number\">14<\/span>,<span class=\"hljs-number\">2<\/span>) NOT <span class=\"hljs-keyword\">NULL<\/span>,\r\n    PRIMARY KEY(sales_employee,fiscal_year)\r\n);\r\n\r\nINSERT INTO sales(sales_employee,fiscal_year,sale)\r\nVALUES(<span class=\"hljs-string\">'Bob'<\/span>,<span class=\"hljs-number\">2016<\/span>,<span class=\"hljs-number\">100<\/span>),\r\n      (<span class=\"hljs-string\">'Bob'<\/span>,<span class=\"hljs-number\">2017<\/span>,<span class=\"hljs-number\">150<\/span>),\r\n      (<span class=\"hljs-string\">'Bob'<\/span>,<span class=\"hljs-number\">2018<\/span>,<span class=\"hljs-number\">200<\/span>),\r\n      (<span class=\"hljs-string\">'Alice'<\/span>,<span class=\"hljs-number\">2016<\/span>,<span class=\"hljs-number\">150<\/span>),\r\n      (<span class=\"hljs-string\">'Alice'<\/span>,<span class=\"hljs-number\">2017<\/span>,<span class=\"hljs-number\">100<\/span>),\r\n      (<span class=\"hljs-string\">'Alice'<\/span>,<span class=\"hljs-number\">2018<\/span>,<span class=\"hljs-number\">200<\/span>),\r\n       (<span class=\"hljs-string\">'John'<\/span>,<span class=\"hljs-number\">2016<\/span>,<span class=\"hljs-number\">200<\/span>),\r\n      (<span class=\"hljs-string\">'John'<\/span>,<span class=\"hljs-number\">2017<\/span>,<span class=\"hljs-number\">150<\/span>),\r\n      (<span class=\"hljs-string\">'John'<\/span>,<span class=\"hljs-number\">2018<\/span>,<span class=\"hljs-number\">250<\/span>);\r\n\r\nSELECT * FROM sales;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">+----------------+-------------+--------+\r\n| sales_employee | fiscal_year | sale   |\r\n+----------------+-------------+--------+\r\n| Alice          |        <span class=\"hljs-number\">2016<\/span> | <span class=\"hljs-number\">150.00<\/span> |\r\n| Alice          |        <span class=\"hljs-number\">2017<\/span> | <span class=\"hljs-number\">100.00<\/span> |\r\n| Alice          |        <span class=\"hljs-number\">2018<\/span> | <span class=\"hljs-number\">200.00<\/span> |\r\n| Bob            |        <span class=\"hljs-number\">2016<\/span> | <span class=\"hljs-number\">100.00<\/span> |\r\n| Bob            |        <span class=\"hljs-number\">2017<\/span> | <span class=\"hljs-number\">150.00<\/span> |\r\n| Bob            |        <span class=\"hljs-number\">2018<\/span> | <span class=\"hljs-number\">200.00<\/span> |\r\n| John           |        <span class=\"hljs-number\">2016<\/span> | <span class=\"hljs-number\">200.00<\/span> |\r\n| John           |        <span class=\"hljs-number\">2017<\/span> | <span class=\"hljs-number\">150.00<\/span> |\r\n| John           |        <span class=\"hljs-number\">2018<\/span> | <span class=\"hljs-number\">250.00<\/span> |\r\n+----------------+-------------+--------+\r\n<span class=\"hljs-number\">9<\/span> rows <span class=\"hljs-keyword\">in<\/span> <span class=\"hljs-keyword\">set<\/span> (0.00 sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The following statement uses the <code>DENSE_RANK()<\/code> function to rank the sales employees by sale amount.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n  sales_employee, \n  fiscal_year, \n  sale, \n  <span class=\"hljs-keyword\">DENSE_RANK<\/span>() <span class=\"hljs-keyword\">OVER<\/span> (\n    <span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span> fiscal_year \n    <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> sale <span class=\"hljs-keyword\">DESC<\/span>\n  ) sales_rank \n<span class=\"hljs-keyword\">FROM<\/span> \n  sales;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The output is as follows:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"308\" height=\"200\" src=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2018\/08\/MySQL-DENSE_RANK-Assign-Rank-to-sales-employees.png\" alt=\"MySQL DENSE_RANK - Assign Rank to sales employees\" class=\"wp-image-6975\" title=\"MySQL DENSE_RANK - Assign Rank to sales employees\" srcset=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2018\/08\/MySQL-DENSE_RANK-Assign-Rank-to-sales-employees.png 308w, https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2018\/08\/MySQL-DENSE_RANK-Assign-Rank-to-sales-employees-200x130.png 200w\" sizes=\"auto, (max-width: 308px) 100vw, 308px\" \/><\/figure>\n\n\n\n<p>In this example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, the <code>PARTITION BY<\/code> clause divided the result sets into partitions using fiscal year.<\/li>\n\n\n\n<li>Second, the <code>ORDER BY<\/code> clause specified the order of the sales employees by sales in descending order.<\/li>\n\n\n\n<li>Third, the <code>DENSE_RANK()<\/code> function is applied to each partition with the order of the rows specified by the <code>ORDER BY<\/code> clause.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the MySQL <code>DENSE_RANK()<\/code> function to rank rows in each partition of a result set.<\/li>\n<\/ul>\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=\"6971\"\n\t\t\t\tdata-post-url=\"https:\/\/www.mysqltutorial.org\/mysql-window-functions\/mysql-dense_rank-function\/\"\n\t\t\t\tdata-post-title=\"MySQL DENSE_RANK 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tutorial shows you how to use the MySQL DENSE_RANK() function to rank rows in each partition of a result set.<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":6941,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-6971","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>MySQL DENSE_RANK() Function By Practical Examples<\/title>\n<meta name=\"description\" content=\"This tutorial shows you how to use the MySQL DENSE_RANK() function to rank rows in each 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.mysqltutorial.org\/mysql-window-functions\/mysql-dense_rank-function\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" 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