{"id":348,"date":"2019-04-07T02:41:31","date_gmt":"2019-04-07T10:41:31","guid":{"rendered":"https:\/\/db2tutorial.com\/?page_id=348"},"modified":"2020-06-29T22:26:13","modified_gmt":"2020-06-30T06:26:13","slug":"db2-having","status":"publish","type":"page","link":"https:\/\/www.db2tutorial.com\/db2-basics\/db2-having\/","title":{"rendered":"Db2 HAVING"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the Db2 <code>HAVING<\/code> clause to specify a search condition for groups.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to Db2 HAVING clause<\/h2>\n\n\n\n<p>When you use the <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-select\/\">SELECT<\/a><\/code> statement to query data from one or more tables, you get a result set that contains all rows of the related tables. To specify a search condition for rows, you use the conditions in the <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-where\/\">WHERE<\/a><\/code> clause.<\/p>\n\n\n\n<p>Similarly, to specify a search condition for the groups of rows returned by the <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-group-by\/\">GROUP BY<\/a><\/code> clause, you use the <code>HAVING<\/code> clause. The following illustrates the syntax of the <code>HAVING<\/code> clause:<\/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\"><span class=\"hljs-keyword\">SELECT<\/span>\n    select_list\n<span class=\"hljs-keyword\">FROM<\/span>\n    table_name\n<span class=\"hljs-keyword\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span>\n    column1,\n    column2,\n    ...\n<span class=\"hljs-keyword\">HAVING<\/span>\n    search_condition;    \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>search_condition<\/code> consists of one or more Boolean expressions that evaluate to true, false, or unknown. The statement returns only groups that satisfy the <code>search_condition<\/code>. In other words, it returns only groups that cause the <code>search_condition<\/code> to evaluate to true.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Db2 HAVING clause examples<\/h2>\n\n\n\n<p>We will use the <code>books<\/code> and <code>publishers<\/code> tables from the <a href=\"https:\/\/db2tutorial.com\/getting-started\/db2-sample-database\/\">sample database<\/a> to demonstrate the <code>HAVING<\/code> clause.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"207\" src=\"https:\/\/db2tutorial.com\/wp-content\/uploads\/2019\/03\/books-and-publishers.png\" alt=\"\" class=\"wp-image-74\" srcset=\"https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/03\/books-and-publishers.png 450w, https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/03\/books-and-publishers-300x138.png 300w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">1) Using Db2 HAVING clause to filter groups example<\/h3>\n\n\n\n<p>This statement finds publishers that have more than 30 books:<\/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\">SELECT<\/span> \n    p.name  publisher, \n    <span class=\"hljs-keyword\">COUNT<\/span>(*) book_count\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\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span> \n    p.name\n<span class=\"hljs-keyword\">HAVING<\/span> \n    <span class=\"hljs-keyword\">COUNT<\/span>(*) &gt; <span class=\"hljs-number\">30<\/span>\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n    book_count;\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<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"267\" height=\"159\" src=\"https:\/\/db2tutorial.com\/wp-content\/uploads\/2019\/04\/db2-having-example.png\" alt=\"db2 having example\" class=\"wp-image-349\"\/><\/figure>\n\n\n\n<p>In this example:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>The <code>GROUP BY<\/code> and <code>COUNT(*)<\/code> function returns publishers with their corresponding book counts<\/li><li>The <code>HAVING<\/code> clause evaluates each group (publisher) and includes only the publishers that have more than 30 books.<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2) Using Db2 HAVING clause to find duplicate rows<\/h3>\n\n\n\n<p>First, <a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-create-table\/\">create a new table<\/a> named <code>t1<\/code> for the demonstration.<\/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\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> t1\n(\n    <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">INT<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span> PRIMARY <span class=\"hljs-keyword\">KEY<\/span>, \n    c1 <span class=\"hljs-built_in\">CHAR<\/span>(<span class=\"hljs-number\">1<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>\n);\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>Second, <a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-insert\/\">insert<\/a> some rows into the <code>t1<\/code> table.<\/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\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> t1(<span class=\"hljs-keyword\">id<\/span>,c1) \n<span class=\"hljs-keyword\">VALUES<\/span>(<span class=\"hljs-number\">1<\/span>,<span class=\"hljs-string\">'A'<\/span>),(<span class=\"hljs-number\">2<\/span>,<span class=\"hljs-string\">'B'<\/span>),(<span class=\"hljs-number\">3<\/span>,<span class=\"hljs-string\">'C'<\/span>),(<span class=\"hljs-number\">4<\/span>,<span class=\"hljs-string\">'C'<\/span>),(<span class=\"hljs-number\">5<\/span>,<span class=\"hljs-string\">'A'<\/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>Third, <a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-select\/\">query<\/a> data from the <code>t1<\/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\">SELECT<\/span> \n    <span class=\"hljs-keyword\">id<\/span>, \n    c1\n<span class=\"hljs-keyword\">FROM<\/span> \n    t1;\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<pre class=\"wp-block-code\"><span><code class=\"hljs\">ID          C1 \n----------- -- \n1           A  \n2           B  \n3           C  \n4           C  \n5           A<\/code><\/span><\/pre>\n\n\n<p>As you can see, the <code>c1<\/code> column has some duplicate values e.g., <code>A<\/code> and <code>C<\/code>. Finding these duplicate rows in a table with many rows is not easy.<\/p>\n\n\n\n<p>Fortunately, you can use the <code>HAVING<\/code> clause to find these duplicate values quickly:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>First, group the values in the column from which you want to find duplicates using the <code>GROUP BY<\/code> clause.<\/li><li>Second, use the <code>COUNT()<\/code> function to get the number of values for each group.<\/li><li>Third, use the <code>HAVING<\/code> clause to filter values whose the number of occurrences is greater than one.<\/li><\/ul>\n\n\n\n<p>Here is the query:<\/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> \n    c1, \n    <span class=\"hljs-keyword\">COUNT<\/span>(c1) value_count\n<span class=\"hljs-keyword\">FROM<\/span> \n    t1\n<span class=\"hljs-keyword\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span> \n    c1\n<span class=\"hljs-keyword\">HAVING<\/span> \n    <span class=\"hljs-keyword\">COUNT<\/span>(c1) &gt; <span class=\"hljs-number\">1<\/span>;<\/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>The following shows the output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">C1 VALUE_COUNT \n-- ----------- \nA  2           \nC  2<\/code><\/span><\/pre>\n\n\n<p>In this tutorial, you have learned how to use the Db2 <code>HAVING<\/code> clause to specify a search condition for groups.<\/p>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div 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