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--测试数据
if not object_id(N'Tempdb..#T') is null
drop table #T
Go
Create table #T([A] nvarchar(21),[B] int)
Insert #T
select N'a',0 union all
select N'a',1 union all
select N'a',0 union all
select N'b',0 union all
select N'b',0 union all
select N'b',0 union all
select N'c',1 union all
select N'c',1
Go
--测试数据结束
SELECT DISTINCT A
FROM #T a
WHERE NOT EXISTS ( SELECT *
FROM #T b
WHERE a.A = b.A
AND b.B <> 0 )