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Foreign Key

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Different Types of SQL Keys

SQL Keys play a very important role in database related task in SQL like retrieve data/record from the table according to the requirement.  A key can be defined as a single or combination of multiple fields/columns in a table. With the help ...

What is FOREIGN KEY Constraint in MySQL?

Note that the "P_Id" column in the "Orders" table points to the "P_Id" column in the "Persons" table. In MySQL, the FOREIGN KEY on one table is used to point a PRIMARY KEY in another table. We have two tables with the following values. ...

ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint

This error generally comes when we want to delete child table row. To solve this problem we have to disable the foreign key checks. SET FOREIGN_KEY_CHECKS=0; Now you can fire your query. DELETE FROM TABLE WHERE ID = 'Somthing'; You can ena...
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