【单选题】列出EMP表中,从事每个工种(JOB)的员工人数( )
B.
select job,count(*) from emp;
C.
select distinct job,count(*) from emp;
D.
select job,count(*) from emp group by job;
【单选题】( )又名塞尺,主要用来测量两平面之间的间隙。
【单选题】---Is the book Lock And Key in the library? --- . The school has just bought many new books.
【简答题】Task 5 Fill in the blanks with the right words or phrases. Change the form where necessary. have the s of, refer to, familiarize, quality, develop, possess, differ from, reliable, assistance, co...
【简答题】( )又名塞尺,主要用来测量两平面之间的间隙。
【单选题】列出EMP表中,从事每个工种(JOB)的员工人数()
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;
【单选题】( )又名塞尺,主要用来测量两平面之间的间隙。
【判断题】对仗的基本类型包括工对、邻对、宽对、借对、流水对。( )