ON DELETE SET NULL 当主表的行被删除的时候 ; 在外键后加上
CXSD Delete Set Maintenance 删除集维护
Delete SET NULL 删除置空
Delete Current Color Set 删除现在的颜色 ; 删除当前颜色集
Delete Procedure Result Set Columns 删除过程结果集列
Result-set-delete Facility 结果集删除机制
Result-Set Delete 删除结果集
Delete Brush Set 删除画笔设置
Delete Attribute Set 删除属性组合
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