When a global variable is referenced within a DML SQL statement or within a trigger, view or routine, a dependency on the fully-qualified global variable name is recorded for the statement or object.

如果DML sql语句、触发器、视图或例程内引用了一个全局变量，将为语句或对象记录关于完全限定全局变量名的依赖关系。

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Unlike CHECK constraints, DML triggers can reference columns in other tables.

与CHECK约束不同的是，dml触发器可以引用其他表中的列。

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Visual Database Tools supports DML Triggers.

可视化数据库工具支持dml触发器。

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