![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
对于第7题的两个基本表,有一个SQL语句: SELECT ENO, ENAME FROM EMP WHERE DNO NOT IN (SELECT DNO FROM DEPT WHERE DNAME='金工车间');其等价的关系代数表达式是:______。
A.
πENO,ENAME(σDNAME≠'金工车间'(EMP DEPT))
C.
πENO,ENAME(EMP)-πENO,ENAME (σDNAME='金工车间'(EMP DEPT))
D.
πENO,ENAME (EMP)-πENO,ENAME (σDNAME≠'金工车间'(EMP DEPT))