sql-行转列2(转置)

lavineeeen2024-05-13 14:16

行转列的常规做法是，group by+sum(if())【或count(if())】

例题：

表table如下：

DDate	shengfu
2015-05-09	胜
2015-05-09	胜
2015-05-09	负
2015-05-09	负
2015-05-10	胜
2015-05-10	负
2015-05-10	负

如果要生成下列结果, 该如何写sql语句?

DDate	胜	负
2015-05-09	2	2
2015-05-10	1	2

sql 复制代码

--建表
create table table1(DDate string, shengfu string) ;
insert overwrite table table1 values ('2015-05-09', "胜"),
       ('2015-05-09', "胜"),
       ('2015-05-09', "负"),
       ('2015-05-09', "负"),
       ('2015-05-10', "胜"),
       ('2015-05-10', "负"),
       ('2015-05-10', "负");

select 
	DDate,
    ,SUM(case when shengfu = '胜' then 1 else 0 end) `胜`
    ,SUM(case when shengfu = '负' then 1 else 0 end) `负`
from table1
group by DDate;