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[英]Combining two SELECT queries from same table but different WHERE clause
[英]Select clause from two different table
SELECT DEPARTMENT.D#,DEPARTMENT.DNAME,DEPARTMENT.MANAGER#
FROM DEPARTMENT,PROJECT
WHERE DEPARTMENT.D# <> PROJECT.D#;
當此代碼在SQL plus中運行時,出現了很多重復的輸出,我的輸出應該只有一次。
不知道這是否是您想要的東西,但是如果您只希望那些沒有任何項目的部門使用
SELECT DEPARTMENT.D#,DEPARTMENT.DNAME,DEPARTMENT.MANAGER#
FROM DEPARTMENT
WHERE DEPARTMENT.D# not in (select PROJECT.D# from project);
希望能幫助到你
維沙德
用於
SELECT DEPARTMENT.D#,DEPARTMENT.DNAME,DEPARTMENT.MANAGER#
FROM DEPARTMENT,PROJECT
WHERE DEPARTMENT.D# != PROJECT.D#;
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