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how can select distinct records within loop

Posted on 2004-04-20
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Last Modified: 2006-11-17
Since i can't do it with the distinct option, was wondering if there is a way to display a record
only once using a loop?
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Question by:alberte
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7 Comments
 
LVL 11

Expert Comment

by:Slimshaneey
ID: 10870119
Why cant you use a dinstinct? What sql are you using??
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Expert Comment

by:L00M
ID: 10870159
I assume you mean you've queried a database and now have a populated recordset.
For whatever reason, you can't use distinct in the query...

So, I would recommend converting the recordset to an array:
http://www.aspfaqs.com/aspfaqs/ShowFAQ.asp?FAQID=161

Now that you have an array, sort it:
http://www.4guysfromrolla.com/webtech/012799-3.shtml

You could then enumerate through the array and check to see if the next row matches the previous row, if not copy the current row to an identical table.
If so, skip it and move on to the next until they don't match. At that point, copy the current row to the identical table, and set the new current row to the non matching row. (Confusing eh?)
In the end, your identical table will hold distinct results.
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Author Comment

by:alberte
ID: 10870303
I don't think i will use an array, I finaly got a query to work but i get more records
then i need and i can't select distinct.
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LVL 11

Expert Comment

by:Slimshaneey
ID: 10870312
Can you show us the query?
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LVL 6

Accepted Solution

by:
sforcier earned 50 total points
ID: 10870563
Does this do what you want?

Dim oldVal
oldVal = ""

While Not(rs.EOF)
   if rs("fieldname") <> oldVal then
      oldVal = rs("fieldname")
      'Show data, or whatever it is you want to do
   end if
   rs.MoveNext
Wend
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LVL 6

Expert Comment

by:sforcier
ID: 10870582
BTW, my code assumes that the recordset is sorted based on the duplicated field. Otherwise it won't work... that's an important thing to point out! :)
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LVL 5

Expert Comment

by:waelothman
ID: 10870709
select Filed1,Field2 , Min(Filed3) as MField3 , Min(Filed4) as MField4 from tablename
group by  Filed1,Field2

where field 1, Field2 is what u wat to be distincit by
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