Cannot add or update a child row: a foreign key constraint fails ( zqbp . zqbp_custom , CONSTRAINT zqbp_custom_ibfk_1 FOREIGN KEY ( custom_trade ) REFERENCES zqbp_industry ( industry_id ))
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zqbp_custom_ibfk_1这是什么？我明白这是外键约束的异常，但是不明白为什么给zqbp_custom加上_ibfk_1？