你可能感興趣的試題

A.select job from emp;
B.select job,count(*) from emp;
C.select distinct job,count(*) from emp;
D.select job,count(*) from emp group by job;
E.select job,sum(empno) from emp group by job;

A.Windows NT
B.Windows 2000
C.Windows 98
D.SCO UNIX
E.Redhat Linux