{"id":3921,"date":"2010-10-30T20:57:12","date_gmt":"2010-10-31T04:57:12","guid":{"rendered":"http:\/\/www.mysqltutorial.org\/?page_id=3921"},"modified":"2023-12-29T16:56:25","modified_gmt":"2023-12-29T23:56:25","slug":"mysql-drop-column","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-drop-column\/","title":{"rendered":"MySQL DROP COLUMN"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to drop a column from a table using the MySQL <code>DROP COLUMN<\/code> statement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to MySQL DROP COLUMN statement<\/h2>\n\n\n\n<p>In some situations, you want to remove one or more columns from a table. In such cases, you use the following&nbsp;<code>ALTER TABLE DROP COLUMN<\/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\">ALTER<\/span> <span class=\"hljs-keyword\">TABLE<\/span> table_name\n<span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">COLUMN<\/span> column_name;<\/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 table that contains the column which you want to drop after the <code>ALTER TABLE<\/code> keywords.<\/li><li>Second, specify the name of the column that you want to drop in the<code>DROP COLUMN<\/code> clause.<\/li><\/ul>\n\n\n\n<p>Note that the keyword <code>COLUMN<\/code> keyword in the <code>DROP COLUMN<\/code> clause is optional so you can use the shorter statement as follows:<\/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\">ALTER<\/span> <span class=\"hljs-keyword\">TABLE<\/span> table_name\n<span class=\"hljs-keyword\">DROP<\/span> column_name;<\/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>To remove multiple columns from a table using a single <code>ALTER TABLE<\/code> statement, you use the following syntax:<\/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\">ALTER<\/span> <span class=\"hljs-keyword\">TABLE<\/span> table_name\n<span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">COLUMN<\/span> column_name_1,\n<span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">COLUMN<\/span> column_name_2,\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>There are some important points you should remember before removing a column from a table:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Removing a column from a table makes all database objects such as <a href=\"https:\/\/www.mysqltutorial.org\/mysql-stored-procedure\/\">stored procedures<\/a>, <a href=\"https:\/\/www.mysqltutorial.org\/mysql-views\/\">views<\/a>, and <a href=\"https:\/\/www.mysqltutorial.org\/mysql-triggers\/\">triggers<\/a> that referencing the dropped column invalid. For example, you may have a stored procedure that refers to a column. When you remove the column, the stored procedure becomes invalid. To fix it, you have to manually change the stored procedure&#8217;s code.<\/li><li>The code from other applications that depends on the dropped column must be also changed, which takes time and efforts.<\/li><li>Dropping a column from a large table can impact the performance of the database during the removal time.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">MySQL DROP COLUMN examples<\/h2>\n\n\n\n<p>First,&nbsp; <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-create-table\/\">create a table<\/a> named <code>posts<\/code> for the demonstration.<\/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\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> posts (\n    <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">INT<\/span> AUTO_INCREMENT PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n    title <span class=\"hljs-built_in\">VARCHAR<\/span>(<span class=\"hljs-number\">255<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n    excerpt <span class=\"hljs-built_in\">VARCHAR<\/span>(<span class=\"hljs-number\">400<\/span>),\n    <span class=\"hljs-keyword\">content<\/span> <span class=\"hljs-built_in\">TEXT<\/span>,\n    created_at DATETIME,\n    updated_at DATETIME\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>Next, use the <code>ALTER TABLE DROP COLUMN<\/code> statement to remove the <code>excerpt<\/code> column:<\/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\">ALTER<\/span> <span class=\"hljs-keyword\">TABLE<\/span> posts\n<span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">COLUMN<\/span> excerpt;<\/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>Then, view the table structure using the <code>DESCRIBE<\/code> statement:<\/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\">DESCRIBE<\/span> posts;<\/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=\"414\" height=\"119\" src=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/08\/MySQL-DROP-COLUMN-example.png\" alt=\"MySQL DROP COLUMN example\" class=\"wp-image-8220\" srcset=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/08\/MySQL-DROP-COLUMN-example.png 414w, https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/08\/MySQL-DROP-COLUMN-example-200x57.png 200w\" sizes=\"auto, (max-width: 414px) 100vw, 414px\" \/><\/figure>\n\n\n\n<p>After that, use the <code>ALTER TABLE DROP COLUMN<\/code> statement to drop the <code>created_at<\/code> and <code>updated_at<\/code> columns:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">ALTER<\/span> <span class=\"hljs-keyword\">TABLE<\/span> posts\n<span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">COLUMN<\/span> created_at,\n<span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">COLUMN<\/span> updated_at;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><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, use the <code>DESCRIBE<\/code> statement to verify the removal:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">DESCRIBE<\/span> posts;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><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=\"382\" height=\"80\" src=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/08\/MySQL-DROP-COLUMN-drop-multiple-columns.png\" alt=\"\" class=\"wp-image-8221\" srcset=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/08\/MySQL-DROP-COLUMN-drop-multiple-columns.png 382w, https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/08\/MySQL-DROP-COLUMN-drop-multiple-columns-200x42.png 200w\" sizes=\"auto, (max-width: 382px) 100vw, 382px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">MySQL drop a column which is a foreign key example<\/h3>\n\n\n\n<p>If you remove the column that is a <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-foreign-key\/\">foreign key<\/a>, MySQL will issue an error. Consider the following example.<\/p>\n\n\n\n<p>First, <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-create-table\/\">create a table<\/a> named <code>categories<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" 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> categories (\n    <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">INT<\/span> AUTO_INCREMENT PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n    <span class=\"hljs-keyword\">name<\/span> <span class=\"hljs-built_in\">VARCHAR<\/span>(<span class=\"hljs-number\">255<\/span>)\n);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><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-basics\/mysql-add-column\/\">add a column<\/a> named <code>category_id<\/code> to the <code>posts<\/code> table.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">ALTER<\/span> <span class=\"hljs-keyword\">TABLE<\/span> posts \n<span class=\"hljs-keyword\">ADD<\/span> <span class=\"hljs-keyword\">COLUMN<\/span> category_id <span class=\"hljs-built_in\">INT<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><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, make the <code>category_id<\/code> column as a foreign key column of that references to the <code>id<\/code> column of the <code>categories<\/code> table.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">ALTER<\/span> <span class=\"hljs-keyword\">TABLE<\/span> posts \n<span class=\"hljs-keyword\">ADD<\/span> <span class=\"hljs-keyword\">CONSTRAINT<\/span> fk_cat \n<span class=\"hljs-keyword\">FOREIGN<\/span> <span class=\"hljs-keyword\">KEY<\/span> (category_id) \n<span class=\"hljs-keyword\">REFERENCES<\/span> categories(<span class=\"hljs-keyword\">id<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><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>Fourth, drop the <code>category_id<\/code> column from the <code>posts<\/code> table.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">ALTER<\/span> <span class=\"hljs-keyword\">TABLE<\/span> posts\n<span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">COLUMN<\/span> category_id;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><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>MySQL issued an error message:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-built_in\">Error<\/span> Code: <span class=\"hljs-number\">1553.<\/span> Cannot drop index <span class=\"hljs-string\">'fk_cat'<\/span>: needed <span class=\"hljs-keyword\">in<\/span> a foreign key constraint<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>To avoid this error, you must remove the foreign key constraint before dropping the column.<\/p>\n\n\n\n<p>In this tutorial, we have shown you how to use MySQL <code>DROP COLUMN<\/code> statement to remove one or more columns from a table.<\/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=\"3921\"\n\t\t\t\tdata-post-url=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-drop-column\/\"\n\t\t\t\tdata-post-title=\"MySQL DROP COLUMN\"\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 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table.<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":174,"menu_order":41,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3921","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to drop column from table using MySQL DROP COLUMN<\/title>\n<meta name=\"description\" content=\"This tutorial shows you how to use MySQL DROP COLUMN statement to remove columns from a table.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-drop-column\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to drop column from table using MySQL 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