If the ID is unique across all records, SELECT * FROM <tablename> WHERE ID NOT IN (SELECT MAX(ID) FROM <tablename>GROUP BY NAme,Desc,Date,Etc) On Thu, 17 Nov 2022 at 16:02, Tom P via ozdotnet <ozdotnet@ozdotnet.com> wrote:
Apologies if this is basic for probably most of you but I just can't get my head around it.
I have a flat table in sql server which contains lots of duplicates, differing only by one column.
Id,Name,Desc,Date,Etc 1,abc,abc abc,2022-11-17,a 2,abc,abc abc,2022-11-17,a 5,def,def def,2022-11-17,a 4,abc,abc abc,2022-11-17,a 3,def,def def,2022-11-17,a 6,xyz,def def,2022-11-17,a
I'm trying to write a query that finds all duplicates *excluding the ones with the highest Id*. So for the above example it would return the following:
Id,Name,Desc,Date,Etc 1,abc,abc abc,2022-11-17,a 2,abc,abc abc,2022-11-17,a 3,def,def def,2022-11-17,a
There are many millions of rows to process so looking for something efficient. Any advice would be appreciated.
Regards Tom
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