Which of the following queries are legal?

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answerhappygod
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Which of the following queries are legal?

Post by answerhappygod »

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;
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