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Query to take a date from one table and retrieve the nearest date from another table.


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  #1  
Old December 31st, 2011, 07:50 AM
YoungL YoungL is offline
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Thumbs up Query to take a date from one table and retrieve the nearest date from another table.
I have two tables which are:

Transactions
------------

Code:
date       | Value 
-------------------------
01/01/2010 | 14.95        
02/01/2010 | 15.95        
05/01/2010 | 15.95        
10/01/2010 | 14.95


I then have another table

ExchangeRates
---------------
Code:
date        | Rate
--------------------------
03/01/2010  | 0.609563
06/01/2010  | 0.610535
10/01/2010  | 0.650213


I want the query to select all the values in the transaction table and find the nearest higher date in the exchange table and give me the rate. So my results would be:

Query Results
-------------
Code:
date       | value | xdate       |  Rate
--------------------------------------------
01/01/2010 | 14.95 | 03/01/2010  | 0.609563  
02/01/2010 | 15.95 | 03/01/2010  | 0.609563  
05/01/2010 | 15.95 | 06/01/2010  | 0.610535 
10/01/2010 | 14.95 | 10/01/2010  | 0.650213


I think it is probably pretty easy to do but I just cannot get my head around this one. I appreciate the help
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  #2  
Old December 31st, 2011, 07:56 PM
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Code:
SELECT t.date
     , t.value
     , e.date as xdate
     , e.rate
  FROM transactions AS t
INNER
  JOIN exchangerates AS e
    ON e.date =
       ( SELECT MIN(date)
           FROM exchangerates
          WHERE date >= t.date )
you actually said "greater than" but by inspecting your desired results, it's clear you meant "equal or greater"
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  #3  
Old January 1st, 2012, 08:19 AM
YoungL YoungL is offline
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Yes I did mean greater than or equal to. I should of made that clearer.

I am getting a syntax error on

Code:
    ON e.date =
       ( SELECT MIN(date)
           FROM exchangerates
          WHERE date >= t.date )


Can't seem to fix the error. Any ideas?

Thanks for your help.


Quote:
Originally Posted by r937
Code:
SELECT t.date
     , t.value
     , e.date as xdate
     , e.rate
  FROM transactions AS t
INNER
  JOIN exchangerates AS e
    ON e.date =
       ( SELECT MIN(date)
           FROM exchangerates
          WHERE date >= t.date )
you actually said "greater than" but by inspecting your desired results, it's clear you meant "equal or greater"
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  #4  
Old January 1st, 2012, 09:18 AM
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please, won't you tell me the error message?
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  #5  
Old January 1st, 2012, 09:28 AM
YoungL YoungL is offline
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Syntax error in query expression 'e.date = ( SELECT MIN(date) FROM exchangerates WHERE date >= t.date'.

that is the error message I am getting.

I should of also been more clear this is a Ms Access database, I am not sure if that makes any difference.
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  #6  
Old January 1st, 2012, 01:32 PM
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Quote:
Originally Posted by YoungL
... this is a Ms Access database, I am not sure if that makes any difference.
it often does

change this --

e.date = ( SELECT MIN(date) FROM exchangerates WHERE date >= t.date )

to this --

e.date = ( SELECT MIN(date) FROM exchangerates WHERE exchangerates.date >= t.date )
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  #7  
Old January 1st, 2012, 05:17 PM
YoungL YoungL is offline
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No luck with that. Still getting the same error as above. Sorry for being a pain lol.
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  #8  
Old January 1st, 2012, 05:51 PM
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Quote:
Originally Posted by YoungL
No luck with that. Still getting the same error as above. Sorry for being a pain lol.
it's not you that's the pain, it's flippin msaccess

try writing [date] instead of date
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  #9  
Old January 2nd, 2012, 03:30 PM
YoungL YoungL is offline
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It's still not liking it. It just doesn't seem to be liking having the subquery as part of the ON clause.

I can get the correct date from the second table using this query:

Code:
SELECT t.date
     , t.gross
     , ( SELECT MIN(exchangerates.date) AS xdate
         FROM exchangerates
         WHERE t.date <= exchangerates.date
        ) as xdate
FROM transactions AS t


But the trouble with this, is I don't know how to also get the rate. Every way I have tried doesn't seem to be working.
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  #10  
Old January 3rd, 2012, 10:34 AM
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try this --
Code:
SELECT y.date
     , y.gross
     , y.xdate
     , z.rate
  FROM ( SELECT t.date
              , t.gross
              , MIN(x.date) AS xdate
           FROM transactions AS t
         INNER
           JOIN exchangerates AS x
             ON x.date >= t.date
         GROUP
             BY t.date
              , t.gross ) AS y    
INNER
  JOIN exchangerates AS z               
    ON z.date = y.xdate
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  #11  
Old January 3rd, 2012, 05:31 PM
YoungL YoungL is offline
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That is awesome, works a treat!!

Thank you so much for that, really appreciate it!
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