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select * from a alias
where not exists
( select * from a where id = '' and alias.pk = pk)
select * from a with(index(ix_xxx)) where id<>''
SELECT TOP 1000 [LogId]
,[PostTime]
FROM [Test].[dbo].[tblDdlLog] where LogId<>''
我怎么测试用了索引呢。。。。