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4.1)
SELECT AVG(SAL) , DEPTNO
FROM scott.emp
GROUP BY DEPTNO;
4.2)
SELECT SUM(SAL) , JOB
FROM scott.emp
GROUP BY JOB;
4.3)
SELECT COUNT(ENAME) , JOB
FROM scott.emp
GROUP BY JOB;
4.4)
SELECT COUNT(ENAME) , DEPTNO
FROM scott.emp
GROUP BY DEPTNO
HAVING COUNT(ENAME) > '3';
4.5)
4.6) ?
SELECT COUNT (*) , DEPTNO
FROM scott.emp
GROUP BY DEPTNO
HAVING (COUNT(JOB = CLERK) = 2);
4.7)
SELECT SUM(SAL) , DEPTNO
FROM scott.emp
WHERE JOB NOT IN ('SALESMAN' , 'PRESIDENT')
GROUP BY DEPTNO;
5.1)
SELECT AVG(GEHALT)
FROM kh.personal;
5.2)
SELECT SUM(GEHALT)
FROM kh.personal
WHERE (BERUF = 'Schwester' OR BERUF = 'Praktikant');
5.3)
SELECT MAX(GEHALT) , MIN(GEHALT) , MAX(GEHALT) - MIN(GEHALT) AS Differenz
FROM kh.personal;
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