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单项选择题

下列语句:

下列哪个SQL语句产生与上面相同的输出,改写成使用运算符?()

    A.select e.ename from emp e where exists(select x.empno from expense x where x.vouch_amt>10000)and x.empno =e.empno;
    B.select e.ename from emp e where exists(select x.empno from expense x where x.vouch_amt>10000and x.empno =e.empno);
    C.select e.ename from emp e where x.empno =e.empno and exists(select x.empno from expense x where x.vouch_amt>10000)
    D.select e.ename from emp e,expense x where x.empno =e.empno and x.vouch_amt>10000and exists(select x.empno from expense x where)

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