【SQL】SQL中简单的行转列题解
作者：互联网
题目：
表:t_user
| userid | class | score |
|---|---|---|
| 1 | a | 90 |
| 1 | b | 80 |
| 1 | c | 70 |
编写SQL输出下列数据
| userid | a | b | c |
|---|---|---|---|
| 1 | 90 | 80 | 70 |
解题：
select
userid,
max(case when class = 'a' then score end) as a,
max(case when class = 'b' then score end) as b,
max(case when class = 'c' then score end) as c
from t_user
group by userid
标签：case,end,题解,SQL,when,转列,score,max,class 来源： https://blog.csdn.net/qq_40180229/article/details/121841056