WHERE DEPT_NO IS NOT
SELECT DEPT_NO, MIN(EMP_SAL), MAX(EMP_SAL)
FROM EMP
WHERE DEPT_NO IS NOT NULL
GROUP BY DEPT_NO
HAVING AVG(EMP_SAL) BETWEEN
(SELECT AVG(EMP_SAL)
FROM EMP) AND 30000.00;
Введение в модель данных SQL
SELECT DEPT_NO, MIN(EMP_SAL), MAX(EMP_SAL)
FROM EMP
WHERE DEPT_NO IS NOT NULL
GROUP BY DEPT_NO
HAVING AVG(EMP_SAL) BETWEEN
(SELECT AVG(EMP_SAL)
FROM EMP) AND 30000.00;