{"id":1466,"date":"2017-11-10T10:55:10","date_gmt":"2017-11-10T03:55:10","guid":{"rendered":"https:\/\/oracletutorial.com\/?page_id=1466"},"modified":"2025-04-21T07:40:34","modified_gmt":"2025-04-21T14:40:34","slug":"plsql-null","status":"publish","type":"page","link":"https:\/\/www.oracletutorial.com\/plsql-tutorial\/plsql-null\/","title":{"rendered":"PL\/SQL NULL Statement"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn about the PL\/SQL NULL statement and how to use it in some programming contexts.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-plsql-null-statement'>Introduction to PL\/SQL NULL statement <a href=\"#introduction-to-plsql-null-statement\" class=\"anchor\" id=\"introduction-to-plsql-null-statement\" title=\"Anchor for Introduction to PL\/SQL NULL statement\">#<\/a><\/h2>\n\n\n\n<p>PL\/SQL NULL statement is a statement that does nothing. It serves as a placeholder statement when you need a syntactical construct in your code but don&#8217;t want to perform any actual action.<\/p>\n\n\n\n<p>The PL\/SQL <code>NULL<\/code> statement has the following format:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">NULL<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The <code>NULL<\/code> statement is a <code>NULL<\/code> keyword followed by a semicolon ( <code>;<\/code>). The <code>NULL<\/code> statement does nothing except that it passes control to the next statement.<\/p>\n\n\n\n<p>The <code>NULL<\/code> statement is useful to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Improve code readability<\/li>\n\n\n\n<li>Provide a target for a <code><a href=\"https:\/\/www.oracletutorial.com\/plsql-tutorial\/plsql-goto\/\">GOTO<\/a><\/code> statement<\/li>\n\n\n\n<li>Create placeholders for subprograms<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='using-plsql-null-statement-to-improve-code-readability'>Using PL\/SQL NULL statement to improve code readability <a href=\"#using-plsql-null-statement-to-improve-code-readability\" class=\"anchor\" id=\"using-plsql-null-statement-to-improve-code-readability\" title=\"Anchor for Using PL\/SQL NULL statement to improve code readability\">#<\/a><\/h2>\n\n\n\n<p>The following code sends an email to employees whose job titles are <code>Sales Representative<\/code>.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">IF<\/span> job_title = <span class=\"hljs-string\">'Sales Representative'<\/span> <span class=\"hljs-keyword\">THEN<\/span>\n    send_email;\n<span class=\"hljs-keyword\">END<\/span> <span class=\"hljs-keyword\">IF<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>What should the program do for employees whose job titles are not <code>Sales Representative<\/code>? You might assume that it should do nothing. Because this logic is not explicitly mentioned in the code, you may wonder if it misses something else.<\/p>\n\n\n\n<p>To make it more clear, you can add a comment. For example:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"> <span class=\"hljs-comment\">-- Send email to only Sales Representative, <\/span>\n<span class=\"hljs-comment\">-- for other employees, do nothing<\/span>\n<span class=\"hljs-keyword\">IF<\/span> job_title = <span class=\"hljs-string\">'Sales Representative'<\/span> <span class=\"hljs-keyword\">THEN<\/span>\n    send_email;\n<span class=\"hljs-keyword\">END<\/span> <span class=\"hljs-keyword\">IF<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Or you can add an <code><a href=\"https:\/\/www.oracletutorial.com\/plsql-tutorial\/plsql-if\/\">ELSE<\/a><\/code> clause that consists of a <code>NULL<\/code> statement to clearly state that no action is needed for other employees.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">IF<\/span> job_title = <span class=\"hljs-string\">'Sales Representative'<\/span> <span class=\"hljs-keyword\">THEN<\/span>\n    send_email;\n<span class=\"hljs-keyword\">ELSE<\/span>\n    <span class=\"hljs-keyword\">NULL<\/span>;\n<span class=\"hljs-keyword\">END<\/span> <span class=\"hljs-keyword\">IF<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Similarly, you can use a <code>NULL<\/code> statement in the <code>ELSE<\/code> clause of a simple&nbsp;<code><a href=\"https:\/\/www.oracletutorial.com\/plsql-tutorial\/plsql-case-statement\/\">CASE<\/a><\/code> statement as shown in the following example:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">DECLARE<\/span>\n  n_credit_status VARCHAR2( <span class=\"hljs-number\">50<\/span> );\n<span class=\"hljs-keyword\">BEGIN<\/span>\n  n_credit_status := <span class=\"hljs-string\">'GOOD'<\/span>;\n\n  <span class=\"hljs-keyword\">CASE<\/span> n_credit_status\n  <span class=\"hljs-keyword\">WHEN<\/span> <span class=\"hljs-string\">'BLOCK'<\/span> <span class=\"hljs-keyword\">THEN<\/span>\n    request_for_aproval;\n  <span class=\"hljs-keyword\">WHEN<\/span> <span class=\"hljs-string\">'WARNING'<\/span> <span class=\"hljs-keyword\">THEN<\/span>\n    send_email_to_accountant;\n  <span class=\"hljs-keyword\">ELSE<\/span>\n    <span class=\"hljs-keyword\">NULL<\/span>;\n  <span class=\"hljs-keyword\">END<\/span> <span class=\"hljs-keyword\">CASE<\/span>;\n<span class=\"hljs-keyword\">END<\/span>;\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this example, if the credit status is not blocked or warning, the program does nothing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='using-plsql-null-statement-to-provide-a-target-for-a-goto-statement'>Using PL\/SQL NULL statement to provide a target for a GOTO statement <a href=\"#using-plsql-null-statement-to-provide-a-target-for-a-goto-statement\" class=\"anchor\" id=\"using-plsql-null-statement-to-provide-a-target-for-a-goto-statement\" title=\"Anchor for Using PL\/SQL NULL statement to provide a target for a GOTO statement\">#<\/a><\/h2>\n\n\n\n<p>When using a <code><a href=\"https:\/\/www.oracletutorial.com\/plsql-tutorial\/plsql-goto\/\">GOTO<\/a><\/code> statement, you need to specify a label followed by at least one executable statement.<\/p>\n\n\n\n<p>The following example uses a <code>GOTO<\/code> statement to quickly move to the end of the program if no further processing is required:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">DECLARE<\/span>\n  b_status <span class=\"hljs-type\">BOOLEAN<\/span> \n<span class=\"hljs-keyword\">BEGIN<\/span>\n  <span class=\"hljs-keyword\">IF<\/span> b_status <span class=\"hljs-keyword\">THEN<\/span>\n    GOTO end_of_program;\n  <span class=\"hljs-keyword\">END<\/span> <span class=\"hljs-keyword\">IF<\/span>;\n  <span class=\"hljs-comment\">-- further processing here<\/span>\n  <span class=\"hljs-comment\">-- ...<\/span>\n  <span class=\"hljs-symbol\">&lt;&lt;end_of_program&gt;&gt;<\/span>\n  <span class=\"hljs-keyword\">NULL<\/span>;\n<span class=\"hljs-keyword\">END<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Note that an error will occur if you don&#8217;t have the <code>NULL<\/code> statement after the <code>end_of_program<\/code> label.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='creating-placeholders-for-subprograms'>Creating placeholders for subprograms <a href=\"#creating-placeholders-for-subprograms\" class=\"anchor\" id=\"creating-placeholders-for-subprograms\" title=\"Anchor for Creating placeholders for subprograms\">#<\/a><\/h2>\n\n\n\n<p>The following example creates a procedure named <code>request_for_approval<\/code> that doesn&#8217;t have the code in the body yet. PL\/SQL requires at least one executable statement in the body of the procedure in order to compile successfully, therefore, we add a <code>NULL<\/code> statement to the body as a placeholder. Later you can fill in the real code.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">PROCEDURE<\/span> request_for_aproval( \n    customer_id NUMBER \n)\n<span class=\"hljs-keyword\">AS<\/span>\n<span class=\"hljs-keyword\">BEGIN<\/span>\n  <span class=\"hljs-keyword\">NULL<\/span>;\n<span class=\"hljs-keyword\">END<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PL\/SQL NULL statement does nothing but serves as a placeholder statement.<\/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=\"1466\"\n\t\t\t\tdata-post-url=\"https:\/\/www.oracletutorial.com\/plsql-tutorial\/plsql-null\/\"\n\t\t\t\tdata-post-title=\"PL\/SQL NULL Statement\"\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 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t\tclass=\"feather feather-thumbs-up block w-full 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