有人向我解释此查询如何逐步进行?

问题描述 投票:0回答:1

我还不明白这个SQL查询

select FIRST_NAME from EMPLOYEES e where DEP_ID != ( select DEP_ID from EMPLOYEES where e.MANAGER_ID = EMPLOYEE_ID);
sql database select
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select FIRST_NAME from EMPLOYEES e where DEP_ID != (Managers dept_ID)
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