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這篇文章主要介紹mysql實(shí)現(xiàn)行轉(zhuǎn)列的方法,文中介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們一定要看完!
mysql實(shí)現(xiàn)行轉(zhuǎn)列的方法:1、用cross join的方式實(shí)現(xiàn),代碼為【cross join(select sum(a.kills) '豬八戒】;2、用case語(yǔ)句的方式實(shí)現(xiàn),代碼為【case when user_name='孫悟空'】。
mysql實(shí)現(xiàn)行轉(zhuǎn)列的方法:
1、用cross join的方式實(shí)現(xiàn)
select * from (select sum(a.kills) '孫悟空' from kills1 as a LEFT JOIN tssrz as b on a.user_id = b.id WHERE b.user_name = '孫悟空' GROUP BY b.user_name) e cross join (select sum(a.kills) '豬八戒' from kills1 as a LEFT JOIN tssrz as b on a.user_id = b.id WHERE b.user_name = '豬八戒' GROUP BY b.user_name) f
2、用case語(yǔ)句的方式實(shí)現(xiàn)
SELECT sum(case when user_name='孫悟空' then kills end) as '孫悟空', sum(case when user_name='豬八戒' then kills END) as '豬八戒', 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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