过滤来自另一个sql server中出现的一个表的行

Question

我正在尝试在SQL Server 2005中执行过滤操作。

实施例。假设我们有两个表，Current和Reject。

Current = 1, 2, 3, 4, 5, 1, 2
Reject = 2, 3, 4

Current \ Reject = 1, 2, 5

如您所见，这两个表共享值。我基本上只想减去这些共享值并将它们放入一个新表中。

这是我尝试过的，但它不起作用。 （A是要匹配的列）。

select * from Current left join
              Reject on csrp.a = rp.a
         group by Current.a, Reject.a
         having count(Current.a) > count(Reject.a)

请注意，元素2已被过滤掉，即使它不应该被过滤掉。

Martin Smith的回答适用于此案例！

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修改

好的，让我们复杂一点吧。假设我有与以前完全相同的情况，除非这次我需要匹配三列而不是一列？

Current = (1, 2, 3), (2, 3, 4), (2, 3, 4), (4, 5, 6), (7, 8, 9), (1, 2, 3)
Reject = (2, 3, 4), (4, 5, 6), (7, 8, 9)

Current \ Reject = (1, 2, 3), (2, 3, 4)

Answer 1

WITH [Current](a, b, c)
     AS (SELECT 1, 2, 3 UNION ALL 
         SELECT 2, 3, 4 UNION ALL 
         SELECT 2, 3, 4 UNION ALL 
         SELECT 4, 5, 6 UNION ALL 
         SELECT 7, 8, 9 UNION ALL 
         SELECT 1, 2, 3),
     Reject(a, b, c)
     AS (SELECT 2, 3, 4 UNION ALL 
         SELECT 4, 5, 6 UNION ALL 
         SELECT 7, 8, 9 ),
     T(RN, a, b, c)
     AS (SELECT ROW_NUMBER() OVER (PARTITION BY a, b, c ORDER BY (SELECT 0)),
                a,
                b,
                c
         FROM   [Current]
         EXCEPT
         SELECT ROW_NUMBER() OVER (PARTITION BY  a, b, c ORDER BY (SELECT 0)),
                a,
                b,
                c
         FROM   Reject)
SELECT DISTINCT a,
                b,
                c
FROM   T