{"id":9728,"date":"2022-10-28T16:38:50","date_gmt":"2022-10-28T11:08:50","guid":{"rendered":"https:\/\/www.skynats.com\/?p=9728"},"modified":"2023-06-15T17:02:37","modified_gmt":"2023-06-15T11:32:37","slug":"how-to-fix-mysql-error-1452","status":"publish","type":"post","link":"https:\/\/www.skynats.com\/blog\/how-to-fix-mysql-error-1452\/","title":{"rendered":"How to Fix MySQL Error 1452?"},"content":{"rendered":"\n<p>Looking for a solution to MySQL Error 1452? You can rely on us.<\/p>\n\n\n\n<p>As a part of our <a href=\"https:\/\/www.skynats.com\/blog\/\" target=\"_blank\" rel=\"noreferrer noopener\">Server Management Services<\/a>, we at Skynats provide answers for all kinds of queries, both big and small.<\/p>\n\n\n\n<p>Let&#8217;s look at how our support staff can assist clients who are experiencing MySQL Error 1452.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-do-i-fix-mysql-error-1452\">How do I fix MySQL Error 1452?<\/h2>\n\n\n\n<p>This error typically happens when we attempt to run a data manipulation query into a table that contains one or more broken foreign key constraints.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-why-does-mysql-error-1452-occur\">Why does MySQL Error 1452 occur?<\/h3>\n\n\n\n<p>The values we are attempting to insert into the table are not present in the referencing (parent) table, which is the root cause of this error.<\/p>\n\n\n\n<p>A Foreign Key is a table column that is referenced from another table.<\/p>\n\n\n\n<p>Consider the table City, which contains the name and ID of a city.<\/p>\n\n\n\n<p>Additionally, there are table Buddies for keeping track of people we know who reside in different cities.<\/p>\n\n\n\n<p>As stated below, the id column of the City table must be used as the FOREIGN KEY of the city_id column in the friends&#8217; table:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE TABLE friends (\nfirstName varchar(255) NOT NULL,\ncity_id int unsigned NOT NULL,\nPRIMARY KEY (firstName),\nCONSTRAINT friends_ibfk_1\nFOREIGN KEY (city_id) REFERENCES City (id)\n)<\/code><\/pre>\n\n\n\n<p>In the preceding code, a CONSTRAINT named buddies_ibfk_1 is created for the city_id column, which refers to the id column of the City table.<\/p>\n\n\n\n<p>This CONSTRAINT states that the city id column can only accept values from the id column.<\/p>\n\n\n\n<p>The following error will appear if we attempt to insert a value into the city_id column that does not already exist in the id column:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ERROR 1452 (23000): Cannot add or update a child row:\na foreign key constraint fails\n(test_db.friends, CONSTRAINT friends_ibfk_1\nFOREIGN KEY (city_id) REFERENCES city (id))<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-how-do-you-fix-it\">How do you fix it?<\/h4>\n\n\n\n<p>Let&#8217;s look at what our support technicians did to fix it:<\/p>\n\n\n\n<p>The MySQL database server ERROR 1452 can be fixed in one of two ways:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>First, enter the value in the associated table.<\/li>\n\n\n\n<li>Afterward, turn off FOREIGN_KEY_CHECKS on the server<\/li>\n<\/ol>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Include the value in the table that is mentioned.<\/li>\n<\/ol>\n\n\n\n<p>The first choice is to add the necessary value to the table that is being referenced.<\/p>\n\n\n\n<p>In the preceding example, add the necessary id value to the City table.<\/p>\n\n\n\n<p>The city_id value we previously inserted can now be used to add a new row to the Buddies table.<\/p>\n\n\n\n<p>Disabling the foreign key check<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>In the MySQL server, disable the FOREIGN_KEY_CHECKS variable.<\/li>\n<\/ol>\n\n\n\n<p>Run the following command to see if the variable is active or not:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SHOW GLOBAL VARIABLES LIKE \u2018FOREIGN_KEY_CHECKS\u2019;\n\n \u2014 +\u2014\u2014\u2014\u2014\u2014\u2014\u2013+\u2014\u2014-+\n\u2014 | Variable_name | Value |\n\u2014 +\u2014\u2014\u2014\u2014\u2014\u2014\u2013+\u2014\u2014-+\n\u2014 | foreign_key_checks | ON |\n\u2014 +\u2014\u2014\u2014\u2014\u2014\u2014\u2013+\u2014\u2014-+<\/code><\/pre>\n\n\n\n<p>Before inserting or updating, this variable instructs MySQL to verify any foreign key constraints that have been added to our table(s).<\/p>\n\n\n\n<p>The variable can be disabled for the current session or globally:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u2014 set for the current session:\nSET FOREIGN_KEY_CHECKS=0;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\u2014 set globally:\nSET GLOBAL FOREIGN_KEY_CHECKS=0;<\/code><\/pre>\n\n\n\n<p>We can now INSERT or UPDATE rows in our table without fear of breaking a foreign key constraint.<\/p>\n\n\n\n<p>When the manipulation query is finished, we can make the FOREIGN_KEY_CHECKS active once more by setting its value to 1:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u2014 set for the current session:\nSET FOREIGN_KEY_CHECKS=1;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\u2014 set globally:\nSET GLOBAL FOREIGN_KEY_CHECKS=1;<\/code><\/pre>\n\n\n\n<p>The city_id column will refer to a NULL column in the City table if the FOREIGN_KEY_CHECKS variable is disabled.<\/p>\n\n\n\n<p>In the future, if we need to run a JOIN query, it might become problematic.<\/p>\n\n\n\n<p>Are you looking for an answer to another query?&nbsp;<a href=\"https:\/\/www.skynats.com\/contact-us\/\" target=\"_blank\" rel=\"noreferrer noopener\">Contact<\/a>&nbsp;our technical support team.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Looking for a solution to MySQL Error 1452? You can rely on us. As a part of our Server Management Services, we at Skynats provide answers for all kinds of queries, both big and small. Let&#8217;s look at how our support staff can assist clients who are experiencing MySQL Error 1452. How do I fix [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,257],"tags":[701],"class_list":["post-9728","post","type-post","status-publish","format-standard","hentry","category-blog","category-mysql","tag-mysql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How to Fix MySQL Error 1452? | Skynats<\/title>\n<meta name=\"description\" content=\"Looking for a solution to MySQL Error 1452? 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