{"id":738,"date":"2019-06-07T20:30:33","date_gmt":"2019-06-08T04:30:33","guid":{"rendered":"https:\/\/db2tutorial.com\/?page_id=738"},"modified":"2020-04-11T06:58:14","modified_gmt":"2020-04-11T14:58:14","slug":"db2-sum","status":"publish","type":"page","link":"https:\/\/www.db2tutorial.com\/db2-aggregate-functions\/db2-sum\/","title":{"rendered":"Db2 SUM"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the DB2 <code>SUM()<\/code> function to calculate the sum of values.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to Db2 SUM() function<\/h2>\n\n\n\n<p>The Db2 <code>SUM()<\/code> function is an <a href=\"https:\/\/db2tutorial.com\/db2-aggregate-functions\/\">aggregate function<\/a> that returns the sum of a set of values.<\/p>\n\n\n\n<p>The following is the syntax of the <code>SUM()<\/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\">SUM(ALL | DISTINCT 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\">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 <code>SUM()<\/code> function accepts a set of numeric values and returns the sum of them.<\/p>\n\n\n\n<p>If you use the <code>DISTINCT<\/code> option, the <code>SUM()<\/code> function will only return the sum of distinct values. If you use the <code>ALL<\/code> option, the <code>SUM()<\/code> function considers all values including duplicates in the calculation. The default is <code>ALL<\/code>.<\/p>\n\n\n\n<p>The <code>SUM()<\/code> function determines the data type of the result based on these rules:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>If the argument is <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-integer\/\">SMALLINT<\/a><\/code> or <code>INT<\/code>, the return type is <code>BIGINT<\/code>.<\/li><li>If the argument is single precision floating-point <code>REAL<\/code>, the return type is double precision floating-point <code>DOUBLE<\/code>.<\/li><li>If the argument is <code>DECFLOAT(n)<\/code>, the return type is <code>DECFLOAT(34)<\/code>.<\/li><li>Otherwise, the return type is the same as the type of the argument.<\/li><\/ul>\n\n\n\n<p>The <code>SUM()<\/code> function returns <code>NULL<\/code> if the set is empty or all values are <code>NULL<\/code>.<\/p>\n\n\n\n<p>Note that the <code>SUM()<\/code> function ignores <code>NULL<\/code> in the calculation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Db2 SUM() illustration<\/h2>\n\n\n\n<p>First, <a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-create-table\/\">create a new table<\/a> named <code>sum_demo<\/code> that contains one <a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-integer\/\">integer<\/a> column:<\/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> sum_demo(c1 <span class=\"hljs-built_in\">INT<\/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>Second, <a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-insert-multiple-rows\/\">insert five rows<\/a> into the <code>sum_demo<\/code> table:<\/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\"><span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> sum_demo(c1) \n<span class=\"hljs-keyword\">VALUES<\/span>(<span class=\"hljs-number\">1<\/span>),(<span class=\"hljs-number\">2<\/span>),(<span class=\"hljs-number\">3<\/span>),(<span class=\"hljs-number\">3<\/span>),(<span class=\"hljs-literal\">NULL<\/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\">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, view the data from the <code>sum_demo<\/code> table by using this <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-select\/\">SELECT<\/a><\/code> statement:<\/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> c1 <span class=\"hljs-keyword\">FROM<\/span> sum_demo;\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>Fourth, use the <code>SUM()<\/code> function to return the sum of values in the <code>c1<\/code> column of the <code>sum_demo<\/code> table, including duplicates.<\/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\">SELECT<\/span> \n    <span class=\"hljs-keyword\">SUM<\/span>(c1) \n<span class=\"hljs-keyword\">FROM<\/span> \n    sum_demo;\n<\/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>Here is the output:<\/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\">TOTAL       \n<span class=\"hljs-comment\">----------- <\/span>\n9      \n<\/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>In this example, the <code>SUM()<\/code> function includes the duplicates because it uses <code>ALL<\/code> option by default.<\/p>\n\n\n\n<p>Fifth, use the <code>DISTINCT<\/code> option in the <code>SUM()<\/code> function to calculate the sum of distinct values.<\/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\">SUM<\/span>(<span class=\"hljs-keyword\">DISTINCT<\/span> c1) total_distinct\n<span class=\"hljs-keyword\">FROM<\/span> \n    sum_demo;\n<\/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>The output is the following:<\/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\">TOTAL_DISTINCT \n<span class=\"hljs-comment\">-------------- <\/span>\n6      \n<\/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>In this example, the <code>SUM()<\/code> function ignores one duplicate value (3) in its calculation because of the <code>DISTINCT<\/code> option.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Db2 SUM() examples<\/h2>\n\n\n\n<p>We&#8217;ll use the <code>books<\/code> table from the <a href=\"https:\/\/db2tutorial.com\/getting-started\/db2-sample-database\/\">sample database<\/a> to demonstrate the <code>SUM()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Using DB2 SUM() function to calculate the sum of values example<\/h3>\n\n\n\n<p>This example uses the <code>SUM()<\/code> function to calculate the total of pages of all books in the <code>books<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" 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\">SUM<\/span>(total_pages) pages\n<span class=\"hljs-keyword\">FROM<\/span>\n    books;\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><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-10\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">PAGES       \n<span class=\"hljs-comment\">----------- <\/span>\n508504  \n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><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<h3 class=\"wp-block-heading\">2) Using DB2 SUM() function with the GROUP BY clause example<\/h3>\n\n\n\n<p>The <code>SUM()<\/code> function is usually used with the <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-group-by\/\">GROUP BY<\/a><\/code> clause to return the totals of groups.<\/p>\n\n\n\n<p>This example returns the total pages of books by publishers:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" 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    p.name publisher, \n    <span class=\"hljs-keyword\">SUM<\/span>(b.total_pages) total_pages\n<span class=\"hljs-keyword\">FROM<\/span> \n    books b\n    <span class=\"hljs-keyword\">INNER<\/span> <span class=\"hljs-keyword\">JOIN<\/span> publishers p\n        <span class=\"hljs-keyword\">ON<\/span> p.publisher_id = b.publisher_id\n<span class=\"hljs-keyword\">WHERE<\/span> \n    total_pages <span class=\"hljs-keyword\">IS<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>\n<span class=\"hljs-keyword\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span> \n    p.name\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> total_pages <span class=\"hljs-keyword\">DESC<\/span>;\t\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><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>This picture displays the partial output:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"382\" height=\"261\" src=\"https:\/\/db2tutorial.com\/wp-content\/uploads\/2019\/06\/db2-sum-function-with-group-by-clause-example.png\" alt=\"\" class=\"wp-image-740\" srcset=\"https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/db2-sum-function-with-group-by-clause-example.png 382w, https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/db2-sum-function-with-group-by-clause-example-300x205.png 300w\" sizes=\"auto, (max-width: 382px) 100vw, 382px\" \/><\/figure>\n\n\n\n<p>In this example, the <code>GROUP BY<\/code> clause groups books by publishers and the <code>SUM()<\/code> function returns the total number of pages for every publisher.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3) Using DB2 SUM() function with the HAVING clause example<\/h3>\n\n\n\n<p>The following statement finds the publishers whose number of pages are higher than 20,000:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" 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    p.name publisher, \n    <span class=\"hljs-keyword\">SUM<\/span>(b.total_pages) total_pages\n<span class=\"hljs-keyword\">FROM<\/span> \n    books b\n    <span class=\"hljs-keyword\">INNER<\/span> <span class=\"hljs-keyword\">JOIN<\/span> publishers p\n        <span class=\"hljs-keyword\">ON<\/span> p.publisher_id = b.publisher_id\n<span class=\"hljs-keyword\">WHERE<\/span> \n    total_pages <span class=\"hljs-keyword\">IS<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>\n<span class=\"hljs-keyword\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span> \n    p.name\n<span class=\"hljs-keyword\">HAVING<\/span>\n    <span class=\"hljs-keyword\">SUM<\/span>(b.total_pages) &gt; <span class=\"hljs-number\">20000<\/span>\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> total_pages <span class=\"hljs-keyword\">DESC<\/span>;\t\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><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<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"268\" height=\"95\" src=\"https:\/\/db2tutorial.com\/wp-content\/uploads\/2019\/06\/db2-sum-function-with-having-clause-example.png\" alt=\"db2 sum function with having clause example\" class=\"wp-image-739\"\/><\/figure>\n\n\n\n<p>In this tutorial, you have learned how to use the Db2 <code>SUM()<\/code> function to calculate the total of a set of values.<\/p>\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=\"738\"\n\t\t\t\tdata-post-url=\"https:\/\/www.db2tutorial.com\/db2-aggregate-functions\/db2-sum\/\"\n\t\t\t\tdata-post-title=\"Db2 SUM\"\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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values.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":644,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-738","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>3 Practical Examples of Db2 SUM() Aggregate Function<\/title>\n<meta name=\"description\" content=\"In this tutorial, you will learn how to use the DB2 SUM() aggregate function to calculate the sum of the non-null values.\" \/>\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.db2tutorial.com\/db2-aggregate-functions\/db2-sum\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"3 Practical 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