sqlserver中如何删除没有主键的重复数据。

-----sqlserver中如何删除没有主键的重复数据。

CREATE TABLE TestTable (

Column1 varchar(1),

Column2 int

);

INSERT INTO TestTable VALUES ('A', 1);

INSERT INTO TestTable VALUES ('A', 1); -- duplicate

INSERT INTO TestTable VALUES ('A', 2);

INSERT INTO TestTable VALUES ('B', 1);

INSERT INTO TestTable VALUES ('B', 2);

INSERT INTO TestTable VALUES ('B', 2); -- duplicate

INSERT INTO TestTable VALUES ('C', 2);

SELECT *

FROM TestTable a

ORDER BY a.Column1, a.Column2;

DELETE

FROM TestTable

WHERE TestTable.%%physloc%%

NOT IN (SELECT MIN(b.%%physloc%%)

FROM TestTable b

GROUP BY b.column1, b.Column2);