列出EMP表中，从事每个工种（JOB）的员工人数（） 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;

列出EMP表中，从事每个工种（JOB）的员工人数（）
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;

出自：Oracle认证

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