{"id":8450,"date":"2019-09-06T02:31:38","date_gmt":"2019-09-06T09:31:38","guid":{"rendered":"http:\/\/www.mysqltutorial.org\/?page_id=8450"},"modified":"2023-10-06T18:36:28","modified_gmt":"2023-10-07T01:36:28","slug":"mysql-drop-trigger","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-triggers\/mysql-drop-trigger\/","title":{"rendered":"MySQL DROP TRIGGER"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the MySQL <code>DROP TRIGGER<\/code> statement to drop a trigger from the database.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to MySQL DROP TRIGGER statement<\/h2>\n\n\n\n<p>The <code>DROP TRIGGER<\/code> statement deletes a trigger from the database.<\/p>\n\n\n\n<p>Here is the basic syntax of the <code>DROP TRIGGER<\/code> statement:<\/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\">DROP<\/span> <span class=\"hljs-keyword\">TRIGGER<\/span> &#91;<span class=\"hljs-keyword\">IF<\/span> <span class=\"hljs-keyword\">EXISTS<\/span>] &#91;schema_name.]trigger_name;\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\">\n<li>First, specify the name of the trigger that you want to drop after the <code>DROP TRIGGER<\/code> keywords.<\/li>\n\n\n\n<li>Second, specify the name of the schema to which the trigger belongs. If you skip the schema name, the statement will drop the trigger in the current database.<\/li>\n\n\n\n<li>Third, use <code>IF EXISTS<\/code> option to conditionally drop the trigger if the trigger exists. The <code>IF EXISTS<\/code> clause is optional.<\/li>\n<\/ul>\n\n\n\n<p>If you drop a trigger that does not exist without using the <code>IF EXISTS<\/code> clause, MySQL issues an error. However, if you use the <code>IF EXISTS<\/code> clause, MySQL issues a <code>NOTE<\/code> instead.<\/p>\n\n\n\n<p>The <code>DROP TRIGGER<\/code> requires the <code>TRIGGER<\/code> privilege for the table associated with the trigger.<\/p>\n\n\n\n<p>Note that if you <a href=\"https:\/\/www.mysqltutorial.org\/mysql-drop-table\">drop a table<\/a>, MySQL will automatically drop all triggers associated with the table.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">MySQL DROP TRIGGER example<\/h2>\n\n\n\n<p>First, <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-create-table\/\">create a table<\/a> called <code>billings<\/code> for demonstration:<\/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> billings (\n    billingNo <span class=\"hljs-built_in\">INT<\/span> AUTO_INCREMENT,\n    customerNo <span class=\"hljs-built_in\">INT<\/span>,\n    billingDate <span class=\"hljs-built_in\">DATE<\/span>,\n    amount <span class=\"hljs-built_in\">DEC<\/span>(<span class=\"hljs-number\">10<\/span> , <span class=\"hljs-number\">2<\/span> ),\n    PRIMARY <span class=\"hljs-keyword\">KEY<\/span> (billingNo)\n);\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:\/\/www.mysqltutorial.org\/mysql-triggers\/mysql-create-trigger\/\">create a new trigger<\/a> called <code>BEFORE UPDATE<\/code> that is associated with the <code>billings<\/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\">DELIMITER $$\n<span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TRIGGER<\/span> before_billing_update\n    <span class=\"hljs-keyword\">BEFORE<\/span> <span class=\"hljs-keyword\">UPDATE<\/span> \n    <span class=\"hljs-keyword\">ON<\/span> billings <span class=\"hljs-keyword\">FOR<\/span> <span class=\"hljs-keyword\">EACH<\/span> <span class=\"hljs-keyword\">ROW<\/span>\n<span class=\"hljs-keyword\">BEGIN<\/span>\n    <span class=\"hljs-keyword\">IF<\/span> new.amount &gt; old.amount * <span class=\"hljs-number\">10<\/span> <span class=\"hljs-keyword\">THEN<\/span>\n        SIGNAL <span class=\"hljs-keyword\">SQLSTATE<\/span> <span class=\"hljs-string\">'45000'<\/span> \n            <span class=\"hljs-keyword\">SET<\/span> MESSAGE_TEXT = <span class=\"hljs-string\">'New amount cannot be 10 times greater than the current amount.'<\/span>;\n    <span class=\"hljs-keyword\">END<\/span> <span class=\"hljs-keyword\">IF<\/span>;\n<span class=\"hljs-keyword\">END<\/span>$$    \nDELIMITER ;\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>If you are not familiar with the <code>DELIMITER<\/code> statement, check it out here in the <a href=\"https:\/\/www.mysqltutorial.org\/mysql-stored-procedure\/getting-started-with-mysql-stored-procedures\/\">stored procedure statement<\/a>.<\/p>\n\n\n\n<p>The trigger activates before any update. If the new amount is 10 times greater than the current amount, the trigger raises an error.<\/p>\n\n\n\n<p>Third, show the triggers:<\/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\">SHOW<\/span> <span class=\"hljs-keyword\">TRIGGERS<\/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<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"530\" height=\"182\" src=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/09\/MySQL-DROP-TRIGGER-example.png\" alt=\"MySQL DROP TRIGGER example\" class=\"wp-image-8451\" srcset=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/09\/MySQL-DROP-TRIGGER-example.png 530w, https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/09\/MySQL-DROP-TRIGGER-example-200x69.png 200w\" sizes=\"auto, (max-width: 530px) 100vw, 530px\" \/><\/figure>\n\n\n\n<p>Fourth, drop the <code>before_billing_update<\/code> trigger:<\/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\">DROP<\/span> <span class=\"hljs-keyword\">TRIGGER<\/span> before_billing_update;<\/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>Finally, show the triggers again to verify the removal:<\/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\">SHOW<\/span> <span class=\"hljs-keyword\">TRIGGERS<\/span>;\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<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"588\" height=\"88\" src=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/09\/MySQL-DROP-TRIGGER-example-after-removal.png\" alt=\"MySQL DROP TRIGGER example after removal\" class=\"wp-image-8452\" srcset=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/09\/MySQL-DROP-TRIGGER-example-after-removal.png 588w, https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/09\/MySQL-DROP-TRIGGER-example-after-removal-200x30.png 200w\" sizes=\"auto, (max-width: 588px) 100vw, 588px\" \/><\/figure>\n\n\n\n<p>In this tutorial, you have learned how to use the MySQL <code>DROP TRIGGER<\/code> statement to drop a trigger from the database.<\/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 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