mysql如何实现行转列

mysql实现行转列的方法：1、用cross join的方式实现，代码为【cross join(select sum(a.kills) '猪八戒】；2、用case语句的方式实现，代码为【case when user_name='孙悟空'】。

本教程操作环境：windows7系统、mysql8.0.22版，该方法适用于所有品牌电脑。

mysql实现行转列的方法：

1、用cross join的方式实现

select * from  (select sum(a.kills) '孙悟空'    from kills1 as a    LEFT JOIN tssrz as b      on a.user_id = b.id   WHERE b.user_name = '孙悟空'   GROUP BY b.user_name) e  cross join   (select sum(a.kills) '猪八戒'    from kills1 as a    LEFT JOIN tssrz as b      on a.user_id = b.id   WHERE b.user_name = '猪八戒'   GROUP BY b.user_name) f

2、用case语句的方式实现

SELECT sum(case when user_name='孙悟空' then kills end) as '孙悟空',   sum(case when user_name='猪八戒' then kills END) as '猪八戒',   sum(case when user_name='沙和尚' then kills END) as '沙和尚'    from tssrz as a    join kills1 as b      on a.id = b.user_id

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