Question

我对sql很新，所以请耐心等待。我有两个名为vascuproimagefile和datamig1.imagefile的表。我想将vascuproimagefile.imagefile与vascuproimagefile.thumbnail和<>进行比较，并返回select * from datamig1, vascuproimagefile where datamig1.ImageFile = vascuproimagefile.ImageFile;彼此的结果。我能够运行这个查询，他们=彼此在哪里，它完美的工作原因为什么它不能用于＆lt;＆gt;

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Answer 1

有几种不同的方法可以做到这一点。一种是使用outer join / null支票：

select d.imagefile
from datamig1 d
   left join vascuproimagefile v on d.imagefile in (v.ImageFile, v.thumbnail)
where v.imagefile is null and v.thumbnail is null

或者您可以使用not exists：

select imagefile
from datamig1 d
where not exists (
    select 1
    from vascuproimagefile v
    where d.imagefile = v.imagefile or d.imagefile = v.thumbnail 
)

sql server从两个表中选择colums不相等的表

1 个答案: