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MySql-返回3个不同的计数
原标题:MySql - return 3 different counts
  • 时间:2011-02-12 20:55:38
  •  标签:
  • mysql

我有4个表,称为用户,跟踪列表,评论,投票。

我想为每个用户返回跟踪列表的数量,所以我做了这个查询:

SELECT datereg, nickname, count(*) 
FROM users JOIN tracklist ON nickname=usersub
GROUP BY nickname 
ORDER BY count(*) DESC, nickname ASC 

现在,我想返回跟踪列表、评论和投票的数量。所以我写道:

SELECT datereg, nickname, count(*) 
FROM users JOIN tracklist ON nickname=usersub JOIN comments ON nickname=usercom JOIN votes ON nickname=uservote
GROUP BY nickname 
ORDER BY count(*) DESC, nickname ASC 

但我也想返回3个不同的计数(*),1个用于跟踪列表,1个用作评论,1个作为投票。

当然,如果count(*)为0,我希望返回0。因此,该值必须在结果中应用,并且不能被忽略。

如何进行此查询?谢谢你的努力!

最佳回答

您可以使用3个子查询

问题回答

暂无回答




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