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Home > Database > Mysql Tutorial > mysql中关于外键约束的小问题

mysql中关于外键约束的小问题

WBOY
Release： 2016-06-06 09:32:48
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mysql

我想问，主表被references后不允许先删除记录，又说从表指定on delete cascade后删除主表记录时从表记录随之删除，你说这不矛盾吗？到底让不让删除？
例如下面这张图，student_table参考teacher_table,我却删不掉主表teacher_table图片说明

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