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Written By Mithilesh Tata
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Updated on May 3rd, 2021
MySQL Error 1451 is an error that can be fixed without any prior technical know-how. It is also sometimes called the foreign key constraint error. You can solve this issue even if you have the basic information about MySQL. However, if you do not make yourself familiar with the concepts and the reasons for the error, you will not be able to fix the error.
MySQL is an open-source relational database software developed to manage the data in different forms. It also allows various operations on the data, like linking an entry of one table to another table. The interlinking of this kind is carried out using a foreign key.
The different tables are used here as per their applicability. There is a child table in which the foreign key is present that carries out the interlinking. Besides, there is also a parent table that gives all the references. The error 1451 arises in my SQL if any task executed on an entry is utilized as a reference for some other table. The error can also occur in the form of a foreign key constraint error.
In this blog, we will guide you to fix Error 1451 in MySQL database Cannot delete or update a parent row: a foreign key constraint fails. But before that, let us go through the reasons that generate the MySQL error code 1451.
MySQL Error 1451 arises due to several reasons. The most common reasons for the error are discussed below.
Cannot delete or update a parent row: a foreign key constraint fails can be generated if the correct sequence of the tasks is not followed while deleting the entries from the parent table. The below error pops up on the screen.
Error 1451 – cannot delete or update a parent row: a foreign key constraint fails
Hence, to prevent this error, the user should try to first delete or drop the foreign key and then, delete the primary key.
Below mentioned methods are described in a stepwise manner to delete the foreign key of the child table and resolve MySQL error 1451.
By following this method, you will be able to delete the foreign key of the child table. The steps are mentioned briefly for your execution.
mysql> DELETE FROM (Child_table_Name)
Where (Row_Name) = (Foreign_key)
mysql> select * (Child_table_Name)
mysql> DELETE FROM (Parent_table_Name)
Where (Row_Name) = (Primary_key)
mysql> SELECT * (Parent_table_Name)
The child table foreign key can also be deleted using the below commands to be entered into MySQL.
mysql> ALTER TABLE (Child_table_Name)
DROP FOREIGN KEY (Foreign_Key_Entry)
mysql> DELETE FROM (Parent_table_Name)
Where (Row_Name) = (Primary_key)
Occasionally, the error code 1451 MySQL is not developed due to any of the above-mentioned reasons. It arises due to the corruption present in the files. If the manual methods discussed above do not solve your error or you find them complex and time-consuming, you can go for an alternate solution. The professional method, MySQL Database Recovery, is an automatic method that recovers all the SQL files and can resolve any error. It repairs the damaged files that cause the errors. Also, this MySQL recovery tool fix MySQL error 1045 (28000) access denied for users.
Here, we have analyzed the reasons that give rise to the error code 1451 MySQL. The error can be resolved by the manual methods that have been discussed. These manual methods fix ERROR 1451: Cannot delete or update a parent row: a foreign key constraint fails. Moreover, these methods are not apt for some users and are not always effective. So, you can directly opt for a professional solution to recover the corrupt database files and it also fix errors like MySQL error 1451, MySQL 1146 table does not exist error. Thanks for reading this blog. I hope you found it helpful.
About The Author:
Mithilesh Tata is a technical expert who has assisted thousands of clients with Microsoft Outlook and other cloud-based email clients. He enjoys writing on email clients backup as well as email migration. He is always excited about giving troubled readers the most up-to-date knowledge, explanation, and user-friendly solutions.
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