{"id":2749,"date":"2019-08-04T20:16:56","date_gmt":"2019-08-05T03:16:56","guid":{"rendered":"https:\/\/oracletutorial.com\/?page_id=2749"},"modified":"2025-06-09T00:09:44","modified_gmt":"2025-06-09T07:09:44","slug":"plsql-comments","status":"publish","type":"page","link":"https:\/\/www.oracletutorial.com\/plsql-tutorial\/plsql-comments\/","title":{"rendered":"PL\/SQL Comments"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: In this tutorial, you will learn how to use PL\/SQL comments, including single-line and multi-line comments, to improve the readability of your code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-plsql-comments'>Introduction to PL\/SQL Comments <a href=\"#introduction-to-plsql-comments\" class=\"anchor\" id=\"introduction-to-plsql-comments\" title=\"Anchor for Introduction to PL\/SQL Comments\">#<\/a><\/h2>\n\n\n\n<p>PL\/SQL comments allow you to describe the purpose of a line or a block of PL\/SQL code.<\/p>\n\n\n\n<p>When compiling the PL\/SQL code, the Oracle precompiler ignores comments. However, you should always use comments to help you and other developers understand it quickly later.<\/p>\n\n\n\n<p>PL\/SQL has types of comments: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Single-line comments<\/li>\n\n\n\n<li>Multi-line comments<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='single-line-comments'>Single-line comments <a href=\"#single-line-comments\" class=\"anchor\" id=\"single-line-comments\" title=\"Anchor for Single-line comments\">#<\/a><\/h2>\n\n\n\n<p>A single-line comment starts with a double hyphen ( <code>--<\/code>) that can appear anywhere on a line and extend to the end of the line.<\/p>\n\n\n\n<p>For example, the following single-line comment explains the meaning of the <code>co_vat_rate<\/code> constant:<\/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-comment\">-- valued added tax 10%<\/span>\n<span class=\"hljs-keyword\">DECLARE<\/span> co_vat_rate <span class=\"hljs-keyword\">CONSTANT<\/span> NUMBER := <span class=\"hljs-number\">0.1<\/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>Sometimes, while testing a program, you may use a single-line comment to disable a line of code. For example:<\/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-comment\">-- UPDATE products SET list_price = 0 WHERE product_id = l_id;<\/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>You can also use the single-line comment if you want to comment just a portion of a line. <\/p>\n\n\n\n<p>The following example shows how to comment out the <code><a href=\"https:\/\/www.oracletutorial.com\/oracle-basics\/oracle-where\/\">WHERE<\/a><\/code> clause of the <code><a href=\"https:\/\/www.oracletutorial.com\/oracle-basics\/oracle-update\/\">UPDATE<\/a><\/code> statement. All the code that follows the double-hyphen <code>--<\/code> to the rest of the line will be treated as a comment:<\/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-keyword\">UPDATE<\/span> products \n<span class=\"hljs-keyword\">SET<\/span> list_price = <span class=\"hljs-number\">0<\/span>; \n<span class=\"hljs-comment\">-- WHERE product_id = l_id;<\/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>Note that we add the semicolon (<code>;<\/code>) before the (<code>--<\/code>) to make the statement valid.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='multi-line-comments'>Multi-line comments <a href=\"#multi-line-comments\" class=\"anchor\" id=\"multi-line-comments\" title=\"Anchor for Multi-line comments\">#<\/a><\/h2>\n\n\n\n<p>A multi-line comment starts with a forward-slash and asterisk ( <code>\/*<\/code> ) and ends with an asterisk and forward-slash ( <code>*\/<\/code> ), and can span multiple lines:<\/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-comment\">\/*\n  This is a multi-line comment\n  that can span multiple lines\n*\/<\/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\">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>It is possible to use a multi-line comment as a single-line comment:<\/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-comment\">\/* A multi-line comment can be used as a single-line comment *\/<\/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>We often use a multi-line comment to describe the purpose of a block of code like the following example:<\/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-comment\">\/*\n    This code allow users to enter the customer id and \n    return the corresponding customer name and credit limit\n*\/<\/span>\n<span class=\"hljs-keyword\">DECLARE<\/span>\n    l_customer_name customers.name<span class=\"hljs-meta\">%TYPE<\/span>;\n    l_credit_limit customers.credit_limit<span class=\"hljs-meta\">%TYPE<\/span>;\n<span class=\"hljs-keyword\">BEGIN<\/span>\n   ...\n<span class=\"hljs-keyword\">END<\/span>;\n\/\n<\/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>For maintainability, it is not a good practice to mix comments as follows:<\/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\">BEGIN<\/span>\n    <span class=\"hljs-comment\">-- single-line comment \/* another comment *\/<\/span>\n    <span class=\"hljs-keyword\">NULL<\/span>;\n    <span class=\"hljs-comment\">\/* \n        multi-line comment \n        -- that has another single-line comment \n    *\/<\/span>\n<span class=\"hljs-keyword\">END<\/span>;\n\/\n<\/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<p>Instead, use the following:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" 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\">BEGIN<\/span>\n    <span class=\"hljs-comment\">-- single-line comment, another comment<\/span>\n    <span class=\"hljs-keyword\">NULL<\/span>;\n    <span class=\"hljs-comment\">\/* \n        multi-line comment \n        that has another single-line comment \n    *\/<\/span>\n<span class=\"hljs-keyword\">END<\/span>;\n\/<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><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='plsql-comment-usage-notes'>PL\/SQL comment usage notes <a href=\"#plsql-comment-usage-notes\" class=\"anchor\" id=\"plsql-comment-usage-notes\" title=\"Anchor for PL\/SQL comment usage notes\">#<\/a><\/h2>\n\n\n\n<p>PL\/SQL does not allow you to nest a multi-line comment within another multi-line comment. The following code block is not valid:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" 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\">BEGIN<\/span>\n    <span class=\"hljs-comment\">\/* \n        a multi-line comment \n        \/*\n            a nested multi-line comment\n        *\/<\/span>\n    *\/ <span class=\"hljs-comment\">-- -&gt; error<\/span>\n<span class=\"hljs-keyword\">END<\/span>;\n\/\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><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>You cannot use single-line comments for a PL\/SQL block that will be processed dynamically. Since the Oracle precompiler will ignore the end-of-line characters that cause the single-line comments to extend to the end of the block. In this case, you can use multi-line comments instead.<\/p>\n\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>Use comments to explain code, making it more understandable.<\/li>\n\n\n\n<li>Single-line comments start with two hyphens (&#8211;). All text from &#8212; to the end of line are is ignored.<\/li>\n\n\n\n<li>Multi-line comments enclose text between \/* and *\/.<\/li>\n\n\n\n<li>Use comments to explain <em>why <\/em>a piece of code does something, not just <em>what <\/em>it does.<\/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=\"2749\"\n\t\t\t\tdata-post-url=\"https:\/\/www.oracletutorial.com\/plsql-tutorial\/plsql-comments\/\"\n\t\t\t\tdata-post-title=\"PL\/SQL Comments\"\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 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