就目前来讲时这样的,不就的将来会支持的^_^楼主的需求可以这样试试SELECT a.Price
FROM Books a left join Publishers b
on a.Publisher_Id = b.Publisher_Id where b.Publisher_Id<>nil and b.Name = 'Corlis'
FROM Books a left join Publishers b
on a.Publisher_Id = b.Publisher_Id where b.Publisher_Id<>nil and b.Name = 'Corlis'
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