A

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Q. Which of the following queries are legal?

  • (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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