mysql RESTRICT

在MySQL中，RESTRICT是一种外键约束的选项之一。当使用RESTRICT选项时，当父表中的记录被删除或更新时，MySQL会首先检查是否存在关联的子表记录。如果存在关联的子表记录，则无法删除或更新父表记录，MySQL会抛出一个错误。因此，RESTRICT选项用于保护数据完整性，防止意外删除或更新操作。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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