Which of the following queries are legal?
Posted: Thu Jul 14, 2022 8:47 am
a) SELECT deptno, count(deptno) FROM emp GROUP BY ename;
b) SELECT deptno, count(deptno), job FROM emp GROUP BY deptno;
c) SELECT deptno, avg(sal) FROM emp;
d) SELECT deptno, avg(sal) FROM emp GROUP BY deptno;
b) SELECT deptno, count(deptno), job FROM emp GROUP BY deptno;
c) SELECT deptno, avg(sal) FROM emp;
d) SELECT deptno, avg(sal) FROM emp GROUP BY deptno;