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How to remove duplicate entries and keep the highest price items
Posted: 23 Jan 04
This FAQ was generated as a result of Thread184-746387 and with the kind help of the contributors involved
The problem originated from merging three tables which ended up with over 700000 records. Once the merge process was completed we then needed to remove all duplicate records but keep the highest priced item for example:
Greatest Hits of The 90's : CD: £12.95
Greatest Hits of The 90's : CD: £13.95
Greatest Hits of The 90's : CD: £11.95
Greatest Hits of The 90's : DVD: £11.95
The item priced at £13.95 was kept and the other two removed although the DVD item was kept even though the title was the same.
Here's the code:
SET SAFETY OFF
SET EXCL OFF
tempfile=SYS(3) && Create Unique DBF file name
COPY STRU TO tempfile+'.dbf'
SELECT TITLE, max(NEWPRICE) as price FROM NEWFILE GROUP BY TITLE INTO TABLE tempfile+'.dbf'
USE NEWFILE EXCL
APPEND FROM tempfile+'.dbf'
INDEX ON TITLE TAG TITLE
DELE FILE tempfile+'.dbf' && Delete the temp file
Hope this helps anyone as much as it as helped us
Many thanks again to the very helpful assistance of the Tek-Tips forum members
Back to Microsoft: Visual FoxPro FAQ Index
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