Question

I have tried this query to get the duplicate records.but I am getting this error.

select * from Codes
where id = 35712 and isactive = 1
group by line_num
having count(*) > 1

I am getting this error.

Msg 8120, Level 16, State 1, Line 1
Column 'Codes.code_id' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

here code_id is the primary key for this table.

can anybody help me out how to get the code_id which have duplicates in this table.

Thanks

Answer 1

In SQL Server 2005 and later you can use aggregate window functions:

;WITH counted AS (
  SELECT
    *,
    Cnt = COUNT(*) OVER (PARTITION BY line_num)
  FROM Codes
  WHERE id = 35712
    AND isactive = 1
)
SELECT *
FROM counted
WHERE Cnt > 1

References:

• Aggregate Functions (Transact-SQL)

• OVER Clause (Transact-SQL)

• WITH common_table_expression (Transact-SQL)