sql-server - SQL 服务器 2008 R2 : Remove single occurrence record.

Question

我有下表，其中包含两列，如下所示:

CREATE TABLE test_lin
(
    Cola INT,
    Colb INT
);

INSERT INTO test_lin VALUES(1,2);
INSERT INTO test_lin VALUES(1,3);
INSERT INTO test_lin VALUES(1,4);
INSERT INTO test_lin VALUES(1,5);
INSERT INTO test_lin VALUES(1,3);
INSERT INTO test_lin VALUES(2,4);
INSERT INTO test_lin VALUES(2,6);
INSERT INTO test_lin VALUES(2,7);
INSERT INTO test_lin VALUES(2,4);
INSERT INTO test_lin VALUES(2,6);

注意:现在我只想显示那些重复多次的记录。就像我的情况一样，(1,3),(2,4),(2,6) 记录在表中重复。

我想从结果集中删除单次出现的记录。单次出现的记录如下图所示。

Answer 1

WITH CTE as 
(
SELECT Cola,Colb,ROW_NUMBER() OVER(PARTITION BY Cola,Colb ORDER BY Cola) AS RN
FROM test_lin
)

SELECT T.* 
FROM test_lin T INNER JOIN  CTE C ON C.COLa = t.Cola and C.COLb = t.Colb and c.RN=2