SQL : SQL error : SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child

SQL : SQL error : SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails
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SQL : SQL error : SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails
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SQL constraint add violation: error foreign constraint SQLSTATE[23000]: 1452 row: a SQL child or : : a fails update Integrity Cannot key