{"id":1756,"date":"2018-11-13T00:04:45","date_gmt":"2018-11-12T17:04:45","guid":{"rendered":"http:\/\/www.sqlitetutorial.net\/?page_id=1756"},"modified":"2024-04-16T10:21:11","modified_gmt":"2024-04-16T03:21:11","slug":"sqlite-cume_dist","status":"publish","type":"page","link":"https:\/\/www.sqlitetutorial.net\/sqlite-window-functions\/sqlite-cume_dist\/","title":{"rendered":"SQLite CUME_DIST() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the SQLite <code>CUME_DIST()<\/code> function to calculate the\u00a0cumulative distribution of a value within a group of values.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to SQLite CUME_DIST() Function<\/h2>\n\n\n\n<p>The <code>CUME_DIST()<\/code> is a <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-window-functions\/\">window function<\/a> that returns the cumulative distribution of a value relative to the values in the group.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>CUME_DIST()<\/code> function:<\/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\">CUME_DIST() OVER (\n  &#91;PARTITION BY partition_expression]\n  &#91;ORDER BY order_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\">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>The <code>PARTITION BY<\/code> clause specifies how the rows are grouped into partitions to which the <code>CUME_DIST()<\/code> function applies. If you skip the <code>PARTITION BY<\/code> clause, the function treats the whole result set as a single partition.<\/li>\n\n\n\n<li>The <code>ORDER BY<\/code> clause specifies the order of rows in each partition to which the <code>CUME_DIST()<\/code> function applies. If you omit the <code>ORDER BY<\/code> clause, the function returns 1 for all rows.<\/li>\n<\/ul>\n\n\n\n<p>Suppose <code>N<\/code> is the value of the current row of the column specified in the <code>ORDER BY<\/code> clause and the order of rows is from low to high, the cumulative distribution of  a value is calculated using the following formula:<\/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\">The number of rows <span class=\"hljs-keyword\">with<\/span> <span class=\"hljs-keyword\">values<\/span> &lt;= N \/ The <span class=\"hljs-built_in\">number<\/span> <span class=\"hljs-keyword\">of<\/span> <span class=\"hljs-keyword\">rows<\/span> <span class=\"hljs-keyword\">in<\/span> the <span class=\"hljs-keyword\">window<\/span> <span class=\"hljs-keyword\">or<\/span> <span class=\"hljs-keyword\">partition<\/span>\n<\/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>The return value of the <code>CUME_DIST()<\/code> function is greater than 0 and less than or equal to 1:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">0 &lt; CUME_DIST() &lt;= 1<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><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 rows with the same values receive the same result.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SQLite CUME_DIST() function example<\/h2>\n\n\n\n<p>First, <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-create-table\/\">create a new table<\/a> named <code>products<\/code> for the demonstration:<\/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\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> products(\n    <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">INTEGER<\/span> PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n    <span class=\"hljs-keyword\">name<\/span> <span class=\"hljs-built_in\">TEXT<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n    color <span class=\"hljs-built_in\">TEXT<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n    price <span class=\"hljs-built_in\">REAL<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span> \n);<\/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>Second, <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-insert\/\">insert<\/a> some rows into the <code>products<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> products\n   (<span class=\"hljs-keyword\">name<\/span>, color, price)\n<span class=\"hljs-keyword\">VALUES<\/span>\n   (<span class=\"hljs-string\">'A'<\/span>, <span class=\"hljs-string\">'red'<\/span>, <span class=\"hljs-number\">100<\/span>),\n   (<span class=\"hljs-string\">'B'<\/span>, <span class=\"hljs-string\">'red'<\/span>, <span class=\"hljs-number\">200<\/span>),\n   (<span class=\"hljs-string\">'C'<\/span>, <span class=\"hljs-string\">'red'<\/span>, <span class=\"hljs-number\">200<\/span>),\n   (<span class=\"hljs-string\">'D'<\/span>, <span class=\"hljs-string\">'black'<\/span>, <span class=\"hljs-number\">300<\/span>),\n   (<span class=\"hljs-string\">'E'<\/span>, <span class=\"hljs-string\">'black'<\/span>, <span class=\"hljs-number\">400<\/span>),\n   (<span class=\"hljs-string\">'F'<\/span>, <span class=\"hljs-string\">'white'<\/span>, <span class=\"hljs-number\">500<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><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>Third, <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-select\/\">query<\/a> data from the <code>products<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" 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> * <span class=\"hljs-keyword\">FROM<\/span> products;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><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\"><span><code class=\"hljs\">id | name | color | price\n---+------+-------+------\n1  | A    | red   | 100.0\n2  | B    | red   | 200.0\n3  | C    | red   | 200.0\n4  | D    | black | 300.0\n5  | E    | black | 400.0\n6  | F    | white | 500.0\n\n(6 rows)<\/code><\/span><\/pre>\n\n\n<p>Fourth, calculate the cumulative distribution of the price in the <code>products<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" 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  <span class=\"hljs-keyword\">name<\/span>,\n  <span class=\"hljs-keyword\">CUME_DIST<\/span>() <span class=\"hljs-keyword\">OVER<\/span> (\n    <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n      price\n  ) PriceCumulativeDistribution\n<span class=\"hljs-keyword\">FROM<\/span>\n  products;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><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\"><span><code class=\"hljs\">name | PriceCumulativeDistribution\n-----+----------------------------\nA    | 0.16666666666666666\nB    | 0.5\nC    | 0.5\nD    | 0.6666666666666666\nE    | 0.8333333333333334\nF    | 1.0\n\n(6 rows)<\/code><\/span><\/pre>\n\n\n<p>Because we skipped the <code>PARTITION BY<\/code> clause, the function treated the whole result set as a single partition. Therefore, the number of rows to be evaluated is 6.<\/p>\n\n\n\n<p>The following example uses the <code>CUME_DIST()<\/code> function to calculate the  cumulative distribution of prices partitioned by colors:<\/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  <span class=\"hljs-keyword\">name<\/span>,\n  color,\n  price,\n  <span class=\"hljs-keyword\">CUME_DIST<\/span>() <span class=\"hljs-keyword\">OVER<\/span> (\n    <span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span> color\n    <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> price\n  ) PriceCumulativeDistribution\n<span class=\"hljs-keyword\">FROM<\/span>\n  products\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> color;<\/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>Output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">name | color | price | PriceCumulativeDistribution\n-----+-------+-------+----------------------------\nD    | black | 300.0 | 0.5\nE    | black | 400.0 | 1.0\nA    | red   | 100.0 | 0.3333333333333333\nB    | red   | 200.0 | 1.0\nC    | red   | 200.0 | 1.0\nF    | white | 500.0 | 1.0\n\n(6 rows)<\/code><\/span><\/pre>\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>CUME_DIST()<\/code> function to calculate the cumulative distribution of value in a set of values.<\/li>\n<\/ul>\n<div 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