{"id":434,"date":"2019-05-31T02:04:05","date_gmt":"2019-05-31T10:04:05","guid":{"rendered":"https:\/\/db2tutorial.com\/?page_id=434"},"modified":"2020-04-11T06:59:20","modified_gmt":"2020-04-11T14:59:20","slug":"db2-cte","status":"publish","type":"page","link":"https:\/\/www.db2tutorial.com\/db2-basics\/db2-cte\/","title":{"rendered":"Db2 CTE"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use Db2 common table expression or CTE to query data from tables.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to Db2 common table expression or CTE<\/h2>\n\n\n\n<p>A common table expression a temporary view defined and used during the duration of a SQL statement.<\/p>\n\n\n\n<p>The following illustrates the syntax of the Db2 CTE:<\/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\">WITH<\/span> cte_name&#91;(column_list)] <span class=\"hljs-keyword\">AS<\/span>\n(CTE_definition)\nSQL_statement;\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\"><li>First, specify the name of the CTE. Later, you can refer to the common table expression name in the SQL statement.<\/li><li>Next, specify a list of comma-separated columns after the table expression name. The number of columns must be equal to the number of column return by the CTE definition.<\/li><li>Then, use the AS keyword after the table expression name or column list if available.<\/li><li>After, provide a SQL statement to feed data to the CTE.<\/li><li>Finally, use a SQL statement such as <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-select\/\">SELECT<\/a><\/code>, <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-insert\/\">INSERT<\/a><\/code>, <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-update\/\">UPDATE<\/a><\/code>, or <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-delete\/\">DELETE<\/a><\/code>that refers the CTE. Notice that you can refer to the same common table expression multiple times in a query.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">When to use DB2 CTE<\/h2>\n\n\n\n<p>You can use a common table expression in the following scenarios:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>When you want to avoid creating views for reference in an SQL statement.<\/li><li>When the same result set needs to be referenced multiple times in a query.<\/li><li>When the results need to be derived using recursion.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">DB2 CTE examples<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the CTE to get a better understanding.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Using CTE to return the average of totals example<\/h3>\n\n\n\n<p>The following query finds the average number of books published between 2000 and 2001 from the <code>books<\/code> table:<\/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\">WITH<\/span> CTE <span class=\"hljs-keyword\">AS<\/span> (\n    <span class=\"hljs-keyword\">SELECT<\/span> \n        <span class=\"hljs-keyword\">YEAR<\/span>(published_date) published_year,\n        <span class=\"hljs-keyword\">COUNT<\/span>(*) published_book\n    <span class=\"hljs-keyword\">FROM<\/span> \n        books\n    <span class=\"hljs-keyword\">WHERE<\/span> \n        published_date <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        <span class=\"hljs-keyword\">YEAR<\/span>(published_date)\n\n)   \n<span class=\"hljs-keyword\">SELECT<\/span> \n    <span class=\"hljs-keyword\">AVG<\/span>(published_book) average_books_pear_year\n<span class=\"hljs-keyword\">FROM<\/span> \n    cte\n<span class=\"hljs-keyword\">WHERE<\/span> \n    published_year <span class=\"hljs-keyword\">BETWEEN<\/span> <span class=\"hljs-number\">2000<\/span> <span class=\"hljs-keyword\">and<\/span> <span class=\"hljs-number\">2018<\/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>In this example:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>First, the <code>cte<\/code> returned the published years of books and the number of published books each year.<\/li><li>Then, the outer query used the <code>cte<\/code> to calculate the average total of books published between the year 2000 and 2018.<\/li><\/ul>\n\n\n\n<p>Here is the output:<\/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\">AVERAGE_BOOKS_PEAR_YEAR \n<span class=\"hljs-comment\">---------------------- <\/span>\n46  \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<h3 class=\"wp-block-heading\">2) Referring a CTE multiple times example<\/h3>\n\n\n\n<p>This query uses the CTE to return the publisher that has the highest average rating of its books.<\/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\">WITH<\/span> cte <span class=\"hljs-keyword\">AS<\/span>(\n    <span class=\"hljs-keyword\">SELECT<\/span> \n        <span class=\"hljs-keyword\">name<\/span>, \n        <span class=\"hljs-keyword\">AVG<\/span>(rating) avg_rating\n    <span class=\"hljs-keyword\">FROM<\/span> \n        books\n    <span class=\"hljs-keyword\">INNER<\/span> <span class=\"hljs-keyword\">JOIN<\/span> publishers <span class=\"hljs-keyword\">USING<\/span> (publisher_id)\n    <span class=\"hljs-keyword\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span> \n        <span class=\"hljs-keyword\">name<\/span>\n)\n<span class=\"hljs-keyword\">SELECT<\/span> \n    <span class=\"hljs-keyword\">name<\/span>, \n    avg_rating\n<span class=\"hljs-keyword\">FROM<\/span> \n    cte \n<span class=\"hljs-keyword\">WHERE<\/span> \n    avg_rating = (<span class=\"hljs-keyword\">SELECT<\/span> <span class=\"hljs-keyword\">MAX<\/span>(avg_rating) <span class=\"hljs-keyword\">FROM<\/span> cte);\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>The following picture shows the output:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"369\" height=\"33\" src=\"https:\/\/db2tutorial.com\/wp-content\/uploads\/2019\/05\/Db2-CTE-example.png\" alt=\"Db2 CTE example\" class=\"wp-image-438\" srcset=\"https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/05\/Db2-CTE-example.png 369w, https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/05\/Db2-CTE-example-300x27.png 300w\" sizes=\"auto, (max-width: 369px) 100vw, 369px\" \/><\/figure>\n\n\n\n<p>In this example, we referenced the common table expression twice once in the query and the other in the <a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-subquery\/\">subquery<\/a>.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>First, the <code>cte<\/code> returns the publisher names and the average rating of their books.<\/li><li>Then, the <code>SELECT<\/code> statement returns the publisher that has the average rating equals to the maximum average rating.<\/li><\/ul>\n\n\n\n<p>In this tutorial, you have learned how to use the Db2 common table expression to query data from tables.<\/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=\"434\"\n\t\t\t\tdata-post-url=\"https:\/\/www.db2tutorial.com\/db2-basics\/db2-cte\/\"\n\t\t\t\tdata-post-title=\"Db2 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