MySql的一道小练习
2016-02-26 20:00
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记录点点滴滴,MySql小练习一题,发现都快忘记了,回头要温习下数据库了
表:
![](http://img.blog.csdn.net/20160226201109018?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center)
得到结果:
![](http://img.blog.csdn.net/20160226201049705?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center)
SQL语句:
select a.name,a.胜,b.负 from
(select name,count(balance) as '胜' from account where balance = '胜' group by name) a
left join (select name,count(balance) as '负' from account where balance = '负' group by name) b
on a.name = b.name
where a.name = b.name;
表:
得到结果:
SQL语句:
select a.name,a.胜,b.负 from
(select name,count(balance) as '胜' from account where balance = '胜' group by name) a
left join (select name,count(balance) as '负' from account where balance = '负' group by name) b
on a.name = b.name
where a.name = b.name;
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