题目内容

简述光伏电站的施工主要内容。

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A. where ename like ‘_HOT%'
B. where ename like ‘H_T%'
C. where ename like ‘%TKA_'
D. where ename like ‘%TOK%'

ALTER TABLE
B. DEFINE TABLE
C. MODIFY TABLE
D. REBUILD TABLE

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;