In the following article we will go through a solution to a very common requirement of getting duplicate rows from SQL Server table based on specific columns. Let us first create a table and add sample data to this table. Col1 in the table is an identity column.

CREATE TABLE #Table1(col1 int, col2 int, col3 char(50))
INSERT INTO  #Table1 values (1, 1, 'data value one')
INSERT INTO  #Table1 values (2, 1, 'data value dup')
INSERT INTO  #Table1 values (3, 2, 'data value two')

Now let us say we want to get duplicates from above table based on values in col1,col2 and col3 then the below query will provide the solution:

  SELECT col1,col2,col3, count(*)
  FROM #t1
  GROUP BY col1,col2,col3
  HAVING count(*) > 1