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                ## 21、列出在部門"SALES"工作的員工的姓名,假定不知道銷售部的部門編號. ![](https://img.kancloud.cn/66/b8/66b83b8b16008a46417accbbbbd098ec_212x182.png) 思路 1.獲取 SALES 部的部門編號 select deptno from dept where dname='SALES' 2.根據步驟1的查詢結果獲取emp表中deptno為步驟1的結果的所有數據 select ename from emp where deptno=( select deptno from dept where dname='SALES')
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