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SQL delete query for duplicate records in Access

Posted on 2008-10-31
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Last Modified: 2012-05-05
This is a follow up question to an earlier question.  I have an Access database with duplicate records.  The key is a composite of FUND, GROUP, ID.  How would I write a query to delete duplicate records in the table.
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Question by:VBStudent
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9 Comments
 
LVL 12

Expert Comment

by:jazzIIIlove
ID: 22852809
Hi there;

DELETE FROM our_table WHERE rowid not in(SELECT MIN(rowid) FROM our_tabl eGROUP BY column1, column2, column3... ;

Here column1, column2, column3 constitute the identifying key for each record.

Best regards...
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Author Comment

by:VBStudent
ID: 22853306
it doesn't appear as though rowid is recognized in Access.  Any other suggestions?
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LVL 7

Expert Comment

by:UniqueData
ID: 22853830
don't award any points to me, just thought I would help out...

rowid is probably referring to a unique record id, usually an AutoNumber field.  I know you have the three fields that make up the key, but do you also have (or can you add) an AutoNumber?

Michael
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LVL 9

Expert Comment

by:jamesgu
ID: 22855495
delete from <table>
inner join ( select FUND, GROUP, ID from <table> group by FUND, GROUP, ID having count(*) > 1) b on
<table>.FUND = a.FUND
<table>.GROUP = GROUP
<table>.ID = a.ID



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LVL 9

Accepted Solution

by:
jamesgu earned 500 total points
ID: 22855516
delete from <table>
from <table>
inner join ( select FUND, GROUP, ID from <table> group by FUND, GROUP, ID having count(*) > 1) b on
<table>.FUND = a.FUND
<table>.GROUP = GROUP
<table>.ID = a.ID

--missed a from clause
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LVL 12

Expert Comment

by:jazzIIIlove
ID: 22856258
yes...rowId is autoNumbered field of yours...
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Author Closing Comment

by:VBStudent
ID: 31512146
Thank you for your help
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Expert Comment

by:sarcharan
ID: 23681243
I thank all of you for helping me. I found one more document to be quite interesting.

delete from t1 where tl.rowid >(select min(tl2.rowID) from t1 tl2 where tl.col1 = tl2.col1 and tl.col2 = tl2.col2)
====================
sp_rename 'dup_authors', 'temp_dup_authors'

select distinct *
into dup_authors
from temp_dup_authors

drop table temp_dup_authors
Deleting-Duplicate-Records.doc
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Expert Comment

by:sarcharan
ID: 23681269
0

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