mysql行列转置

--创建行转列表及插入数据
create table tb_RowConvertToColumn
(
   username nvarchar(100) null,
   course nvarchar(100) null,
   score numeric(10,2) null
)
insert into tb_RowConvertToColumn(username,course,score) values('张三','语文',82)
insert into tb_RowConvertToColumn(username,course,score) values('张三','数学',85)
insert into tb_RowConvertToColumn(username,course,score) values('张三','外语',90)
insert into tb_RowConvertToColumn(username,course,score) values('李四','语文',86)
insert into tb_RowConvertToColumn(username,course,score) values('李四','数学',82)
insert into tb_RowConvertToColumn(username,course,score) values('李四','外语',92)
insert into tb_RowConvertToColumn(username,course,score) values('王五','语文',82)
insert into tb_RowConvertToColumn(username,course,score) values('王五','数学',94)
insert into tb_RowConvertToColumn(username,course,score) values('王五','外语',82)

--1.静态sql行转列，该sql指定了转换的列头
select username '姓名',
       MAX(case course when '语文' then score else 0 end) '语文',
       MAX(case course when '数学' then score else 0 end) '数学',
       MAX(case course when '外语' then score else 0 end) '外语'
from tb_RowConvertToColumn
group by username
order by username