What is Error Code 1451 in MySQL

Error Code 1451 in MySQL usually occurs when you try to delete a record from a parent table that is still being used by a child table. This happens because the primary key in the parent table is linked to a foreign key in the child table, and MySQL doesn’t allow deletion unless that link is removed first. Other common causes include mismatched data types between the two tables, different collations, or a difference in the "signed" or "unsigned" settings of the columns. To avoid this error, make sure the foreign key setup is correct and consistent in both tables before performing delete operations.