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Find Nearest Value

Posted on 2004-09-27
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Last Modified: 2012-06-21
I have two tables:

Table 1
(field names)    UlDate                         UlPrice
                       9/25/2004 9:55:01am   16.50
etc

Table 2
(field names)    OptDate                         OptPrice
                       9/25/2004 9:55:34am     35.50
etc..

I would like to find the nearest UlDate in Table 1 that is nearest to the OptDate in each row of Table 2 then I would like to extract the UlPrice in Table 1 for that nearest date entry and display it in Query 1.  It would look something like this:

Query 1
(field names)    OptDate                         OptPrice         UlPrice
                       9/25/2004 9:55:34am     35.50             16.50
etc..


I believe that there is a relatively easy way of doing this through a simple query expression function.  Please note there may be NO exact match and I will need to control whether I want to match for a value(date) greater or smaller.  I would like to avoid writing a macro and simply do this through a query expression.  Table 1 has about 1M rows, Table 2 has about 1M rows as well.

I would appreciate any suggestions for the query function expression.  Thanks.
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Question by:adorenbaum
7 Comments
 
LVL 77

Expert Comment

by:peter57r
ID: 12162980
Hello adorenbaum,

Are you saying that the only field involved in the match is the datetime field?
(NONE of the other fields matter)

Pete
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Expert Comment

by:EDDYKT
ID: 12163043
Try this

SELECT OptDate, OptPrice, UlPrice FROM Table1 INNER JOIN Table2 ON (abs(datediff ("s", Table1.UlDate, Table2.OptDate)) < 60)


You can change 60 to whatever the limit you want
where 60 is in second
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Author Comment

by:adorenbaum
ID: 12163791
peter57r:

Yes.  Please note this is NOT AN EXACT MATCH, but find the nearest value (greater or lesser as specified by me).
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Author Comment

by:adorenbaum
ID: 12163844
EDDYKT:

Thanks for your comment.  Two questionsL

1.  How do I change your syntax if I want to find the nearest GREATER value vs. find the nearest LESSER value?

2.  Can I enter your code directly into a query builder in design view or will I need to access this through a macro.  (I'm familiar with VB but I would like to avoid writing a full macro.  Instead, I would like to simply enter a function expression into the design view query builder).

Thanks.
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LVL 44

Expert Comment

by:GRayL
ID: 12164292
select first max(a.uldate), a.ulprice, b.optdate, b.optprice from table1 as a, table2 as b
where a.uldate < b.optdate;

Closest uldate that is less than optdate

select first min(a.uldate), a.ulprice, b.optdate, b.optprice from table1 as a, table2 as b
where a.uldate > b.optdate;

Closest uldate that is more than optdate
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LVL 53

Expert Comment

by:Gustav Brock
ID: 12332390
This should do in one go:

  SELECT
    tblTable2.*,
    (SELECT TOP 1
      T.UlDate
    FROM
      tblTable1 AS T
    GROUP BY
      T.UlDate
    ORDER BY
      Min(Abs(DateDiff("d",[tblTable2]![OptDate],T![UlDate])));) AS NearestDate
  FROM
    tblTable2;

/gustav
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Gustav Brock earned 1500 total points
ID: 12635366
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/gustav
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