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Compare 2 Table

Posted on 2000-04-19
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Last Modified: 2010-05-02
How can I compare an old table with a new table in order to filter out the new records added to the new table.

Thanks.
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Question by:choonfong
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4 Comments
 
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Accepted Solution

by:
deighton earned 50 total points
ID: 2730181
Open both tables,
read new table a record a time.
do a oldtable.FindFirst on the old table looking for records matching those in new table.

if oldtable.nomatch = true then record is new

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LVL 10

Expert Comment

by:caraf_g
ID: 2730220
Hi choonfong,

A very similar question has been asked in http://www.experts-exchange.com/jsp/qShow.jsp?ta=visualbasic&qid=10330744 
See my comments there.

You can use a similar technique on recordsets, provided they're ordered.
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LVL 10

Expert Comment

by:caraf_g
ID: 2730225
Just in case you don't know, you can get an ordered recordset quite easily by using an sql statement such as

"SELECT * FROM YOURTABLE WHERE SOMECONDITION ORDER BY UNIQUEFIELDS"

Make sure the order criteria make up a unique key otherwise you'll have trouble finding out whether two records with identical criteria are in fact the same record ;-)
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LVL 2

Expert Comment

by:brice123
ID: 2730252
You could use a simple SQL statement.
For example (in MS-SQL 7) :

select
      t1.SectorID,
      t1.Description
from
      Sectors t1
left outer join
      NewSectors t2
on       t1.SectorID = t2.SectorID
where      
      t2.Description is Null
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