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Focal Point    Focal Point Forums  Hop To Forum Categories  WebFOCUS/FOCUS Forum on Focal Point     [SOLVED] Unequality in JOINs?

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[SOLVED] Unequality in JOINs?
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Wep5622
Virtuoso
posted
I'm working with some temporal data at the moment, which got me wondering if there's some trick to perform joins with that table. Up until now we've always created a hold-file with some discrete key to give us a column to join to, but that approach isn't always going to help us I expect...

The table at hand is one containing currencies and exchange rates at the dates those changed. I have to join a table with financial data against that, so I can sum up the totals per year.

For example, we have:
 Code | Start   | Expired | Rate
------+---------+--------------------
 USD  | 1100331 | 1100531 | 1.351351
      | 1100531 | 1100930 | 1.230012
      | 1100930 |    NULL | 1.333333
 GBP  | 1100531 | 1100630 | .869565
      | 1100630 |    NULL | .826446


Now if I have a record:
 Date    | Customer | Amount
---------+----------+--------
 1100603 |      127 | 534.21


How do I join those two?
In SQL I would write something like:
SELECT t1.Amount/t2.Rate AS 'Amount', t1.Customer, t1.Date
  FROM ledger AS t1
 INNER JOIN exchange_rates AS t2 ON (t1.Date BETWEEN t2.Start AND t2.Expired)
(I'm ignoring the NULL-case to keep the example simple)

Is something like this possible in WebFOCUS?

I suppose I could use MacGuyver to join that exchange-rate table in such a way that there would be an exchange-rate record for every given date. That does seem a bit excessive though?

This message has been edited. Last edited by: Wep5622,


WebFOCUS 8.1.03, Windows 7-64/2008-64, IBM DB2/400, Oracle 11g & RDB, MS SQL-Server 2005, SAP, PostgreSQL 11, Output: HTML, PDF, Excel 2010
: Member of User Group Benelux :
 
Posts: 1669 | Location: Enschede, Netherlands | Registered: August 12, 2010Report This Post
GamP
Virtuoso
posted Hide Post
Look up documentation on 'Conditional Joins'. It is especially created for this kind of things.


GamP
- Using AS 8.2.01 on Windows 10 - IE11.
in Focus since 1988
 
Posts: 1961 | Location: Netherlands | Registered: September 25, 2007Report This Post
Wep5622
Virtuoso
posted Hide Post
Thanks, that looks like what I'm looking for.


WebFOCUS 8.1.03, Windows 7-64/2008-64, IBM DB2/400, Oracle 11g & RDB, MS SQL-Server 2005, SAP, PostgreSQL 11, Output: HTML, PDF, Excel 2010
: Member of User Group Benelux :
 
Posts: 1669 | Location: Enschede, Netherlands | Registered: August 12, 2010Report This Post
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