troubleshooting Question

Oracle SQL

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stummjFlag for United Kingdom of Great Britain and Northern Ireland asked on
Oracle DatabaseSQL
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Hello experts

I have a table of arounr 50000 rows. I need to find the rows where one of the columns has duplicate values.

So, for example I may have:

1234                               REF001           1/1/11     3/2/11
1234                               REF001            4/2/11
1323                               REF002           12/1/11
1263                               REF003            17/4/11
7626                               REF004            16/2/11  17/2/11
6766                               REF004             18/2/11

So in this example I want 4 rows returning. Those with REF001 and REF004, as they both have duplicate references.

Can anyone help me out with the query?
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