MySQL橫縱表相互轉化

先建立乙個成績表（縱表）

create

table user_score
( name varchar(20),
subjects varchar(20),
score int
);insert
into user_score(name,subjects,score) values('張三','語文',60);
insert
into user_score(name,subjects,score) values('張三','數學',70);
insert
into user_score(name,subjects,score) values('張三','英語',80);
insert
into user_score(name,subjects,score) values('李四','語文',90);
insert
into user_score(name,subjects,score) values('李四','數學',100);
再建立乙個成績表（橫表）
create

table user_score2
( name varchar(20),
yuwen int,
shuxue int,
yingyu int
);insert
into user_score2(name,yuwen,shuxue,yingyu) values('張三',60,70,80);
insert
into user_score2(name,yuwen,shuxue,yingyu) values('李四',90,100,0);
縱表轉橫表
select name,sum(case subjects when

'語文'
then score else
0end) as
'語文',sum(case subjects when
'數學'
then score else
0end) as
'數學', sum(case subjects when
'英語'
then score else
0end) as
'英語'
縱表轉橫表
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