Введение в модель данных SQL

FROM EMP, DEPT


SELECT DEPT.DEPT_NO
FROM DEPT, EMP
WHERE DEPT.DEPT_NO = EMP.DEPT_NO
GROUP BY DEPT.DEPT_NO
HAVING AVG(EMP.EMP_SAL) IN
(SELECT MAX(EMP1.EMP_SAL)
FROM EMP, DEPT DEPT1
WHERE EMP.DEPT_NO = DEPT1.DEPT_NO
AND DEPT1.DEPT_NO <> DEPT.DEPT_NO
GROUP BY DEPT.DEPT_NO);

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