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原标题:SQL select column when there s more than one of the same name
  • 时间:2011-11-23 15:28:48
  •  标签:
  • sql
  • call

我有这样的问询。

select *
from alldistros t1
LEFT join origin t2 on t1.name=t2.name
LEFT join desktop t3 on t2.name=t3.name
LEFT join beginnerdistributions t4 on t3.name=t4.name

在我的所有表格中加入。 但是,现在,当我选择名称领域时(这在其中都是如此),我就能够表明这一点。 当我打电话时,这只是空话。 我想这样说,因为同一名字有一栏以上。

我可以做些什么来解决这个问题?

简单地说,一个平原加入打工,因为它排除了其他表格中没有财产的某些领域。

最佳回答

您可使用《公约》关键词来命名一栏。 例如:

select t1.name AS DistroName, t2.name AS OriginName, t3.name AS DesktopName
from alldistros t1
LEFT join origin t2 on t1.name=t2.name
LEFT join desktop t3 on t2.name=t3.name
LEFT join beginnerdistributions t4 on t3.name=t4.name
问题回答
select
  t1.name as t1_name,
  t2.name as t2_name,
  t3.name as t3_name
from alldistros t1
LEFT join origin t2 on t1.name=t2.name 
LEFT join desktop t3 on t2.name=t3.name 
LEFT join beginnerdistributions t4 on t3.name=t4.name

不能确定它只带有甲骨质,但美国广播公司可以向您提出询问:

SELECT *
FROM TABLEA
JOIN TABLEB USING (NAME)

这只能从选任考试委员会中恢复一栏。





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