From an SQL perspective, the merge statement is a DML SQL statement with the same semantics as other DML statements, including insert, update, and delete.
从SQL的角度看，merge语句是与其他dml语句具有相同语义的DML sql语句，包括insert、update、以及delete。
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。
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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