A key thing to notice here is the existence of a DEPTID column in both tables.

这里需要重点注意的是，在both表中有一个deptid列。

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Using JoinRowSet lingo, our JOIN operation was performed using a match column of DEPTID.

在使用JoinRowSet lingo时，JOIN操作是通过匹配列deptid来执行的。

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Query 19 returns the deptID of those departments which have a unit manager among their employees.

查询 18 返回其员工中包含单位主管的那些部门的 deptID。

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