Введение в модель данных SQL

FROM EMP WHERE DEPT_NO IS


SELECT DEPT_NO, AVG (CURRENT_DATE - EMP_BDATE) FROM EMP WHERE DEPT_NO IS NOT NULL GROUP BY DEPT_NO HAVING NOT EXISTS (SELECT EMP1.DEPT_NO FROM EMP EMP1 WHERE EMP1.DEPT_NO IS NOT NULL GROUP BY EMP1.DEPT_NO HAVING AVG (CURRENT_DATE - EMP1.EMP_BDATE) < AVG (CURRENT_DATE - EMP.EMP_BDATE));
Пример 15.12.1.
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