为mysql数据表添加外键（三）总结

InnoDB也支持外键约束。InnoDB中对外键约束定义的语法看起来以下：mysql [CONSTRAINT symbol] FOREIGN KEY [id] (index_col_name, ...)     REFERENCES tbl_name (index_col_name, ...)     [ON DELETE {RESTRICT | | SET NULL | NO ACTION}]

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