本文介绍了MYSQL在两列中选择DISTINCT值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想在数据库中选择不同的值.让我为您介绍一个简单的例子.
I want to select distinct values in a database. Let me run you through a quick example.
表格:
foo bar --- --- a c c f d a c a f c a c d a a c c a f c对,假设我的SQL是SELECT DISTINCT foo, bar from table.这些是我的结果:
Right, let's say my SQL is SELECT DISTINCT foo, bar from table. These are my results:
foo bar --- --- a c c f d a c a f c但是,问题是a c/c a重复存在,只是它们的顺序不同.我不想选择这些,我希望这两列中都有不同的值,请帮忙!
However the problem is is that there are repetitions of a c / c a just that they are in a different order. I don't want to select these, I want distinct values from both columns, please help!
推荐答案非常邪恶&邪恶:
very very wicked & evil:
select distinct least(foo, bar) as value1 , greatest(foo, bar) as value2 from table更多推荐
MYSQL在两列中选择DISTINCT值
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