mysql数据横向变纵向命令求助

select 'enkey' enkey,

cast(sum(case when t.enkey = 'a' then 1 else 0 end) as varchar) a,

cast(sum(case when t.enkey = 'b' then 2 else 0 end) as varchar) b,

cast(sum(case when t.enkey = 'c' then 3 else 0 end) as varchar) c

from (select enkey,listkey from indexlists where enkey in('M','A','XS','YS','TZ') ) t

union all

select 'listkey','a','b','c'

1、在mysql环境，创建数据库表，

create table test_data1(id int, name VARCHAR(20), day VARCHAR(20))

2、插入测试数据，

insert into test_data1 values(1,'liu',1)

insert into test_data1 values(2,'liu',3)

insert into test_data1 values(3,'wang',1)

insert into test_data1 values(4,'wang',2)

insert into test_data1 values(4,'wang',4)

3、查询表中数据，select * from test_data1；

4、编写目标sql；

select name, 

     max(case when day=1 then 1 end) d_1,

     max(case when day=2 then 2 end) d_2,

     max(case when day=3 then 3 end) d_3,

     max(case when day=4 then 4 end) d_4

from test_data1 t group by name

整理数据 :

看一下数据

拼接成Table，这里简单演示

结果展示

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