外键约束
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添加外键约束时报错： SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails
1、添加外键约束时报错： SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a …
1、添加外键约束时报错： SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a …