本文实例讲述了MySQL横纵表相互转化操作实现方法。分享给大家供大家参考，具体如下：

先创建一个成绩表（纵表）

create table user_score(name varchar(20),subjects varchar(20),score int);insert into user_score(name,subjects,score) values('张三','语文',60);insert into user_score(name,subjects,score) values('张三','数学',70);insert into user_score(name,subjects,score) values('张三','英语',80);insert into user_score(name,subjects,score) values('李四','语文',90);insert into user_score(name,subjects,score) values('李四','数学',100);

再创建一个成绩表（横表）

create table user_score2(name varchar(20),yuwen int,shuxue int,yingyu int);insert into user_score2(name,yuwen,shuxue,yingyu) values('张三',60,70,80);insert into user_score2(name,yuwen,shuxue,yingyu) values('李四',90,100,0);

纵表转横表

select name,sum(case subjects when '语文' then score else 0 end) as '语文',sum(case subjects when '数学' then score else 0 end) as '数学', sum(case subjects when '英语' then score else 0 end) as '英语'from user_score group by name;

纵表转横表

SELECTname,'yuwen'AS subjects,yuwenASscoreFROMuser_score2UNIONALLSELECTname,'shuxue'AS subjects,shuxueASscoreFROMuser_score2 UNIONALLSELECTname,'yingyu'AS subjects,yingyuASscoreFROMuser_score2 ORDER BY name,subjects DESC;