Question : Sql query to find duplicate

Hi,
Need to select refno field and Ninumber where I have more than 1 Ninumber from table1

Cheers

Answer : Sql query to find duplicate

small fix, it must be > 1 and not >= 1  (or >= 2 ... )
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SELECT refno, Ninumber FROM
table_name WHERE Ninumber in (
SELECT Ninumber FROM
table_name GROUP BY Ninumber HAVING COUNT(*) > 1)
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