小问题问一下

Question

select sum(writtenExam) from 学员成绩表 where  writtenExam 
该怎么求这表中writtenExam的总成绩 代码该如何写下去
请不要见笑

Answer 1

select sum(writtenExam) from 学员成绩表 
这样就求出来了啊

Answer 2

select sum(writtenExam) from 学员成绩表
?

Answer 3

select sum(writtenExam) from 学员成绩表 这样就可以了
如果是根据什么要求
select ...,sum(writtenExam) from 学员成绩表 group by ...

Answer 4

select sum(writtenExam) from 学员成绩表