Duplicate key value violates unique constraint. Cannot add foreign key constraint. cannot add or update a child row: a foreign key constraint fails. failed to add the foreign key constraint. missing index for constraint. php pdostatement.

Duplicate key value violates unique constraint. Cannot add foreign key constraint. cannot add or update a child row: a foreign key constraint fails. failed to add the foreign key constraint. missing index for constraint. php pdostatement.
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