Can you help me with SQL statements to find duplicates on multiple fields?
For example, in pseudo code:
select count(field1,field2,field3)
from table
where the combination of field1, field2, field3 occurs multiple times
and from the above statement if there are multiple occurrences I would like to select every record except the first one.
Solution
To get the list of fields for which there are multiple records, you can use..
select field1,field2,field3, count(*)
from table_name
group by field1,field2,field3
having count(*) > 1
Check this link for more information on how to delete the rows.
http://support.microsoft.com/kb/139444
Edit : As the other users mentioned, there should be a criterion for deciding how you define “first rows” before you use the approach in the link above. Based on that you’ll need to use an order by clause and a sub query if needed. If you can post some sample data, it would really help.
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