相关疑难解决方法(0)

以下是tsql查询:

DECLARE @table TABLE(data VARCHAR(20))
INSERT INTO @table VALUES ('not duplicate row')
INSERT INTO @table VALUES ('duplicate row')    
INSERT INTO @table VALUES ('duplicate row')    
INSERT INTO @table VALUES ('second duplicate row')    
INSERT INTO @table VALUES ('second duplicate row')

SELECT   data    
INTO     #duplicates    
FROM     @table    
GROUP BY data    
HAVING   COUNT(*) > 1    

-- delete all rows that are duplicated   
DELETE   FROM @table    
FROM     @table o INNER JOIN #duplicates d
         ON d.data = o.data         

-- insert one row for every duplicate set …