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Focal Point    Focal Point Forums  Hop To Forum Categories  WebFOCUS/FOCUS Forum on Focal Point     Conditional Join in DB2

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Conditional Join in DB2
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Francis Mariani
Expert
posted
I'm having a bit of trouble with a Conditional Join with DB2 tables.

I expected the generated SQL to reflect the conditional join, i.e. that the SQL would look something like this:

SELECT distinct
T1.COMM_CUST_FAC_KEY, T1.DEFAULT_DT, T1.FAC_TP_CD,
T1.PROD_CD, T1.RESOLUTION_IND, T1.RESOLUTION_DT,
T1.COMM_CUST_KEY, T2.TIME_DIM_KEY, T2.PERIOD_TYPE,
T2.PERIOD_START_DT, T2.PERIOD_END_DT
FROM
BSLC.DFLT_COMM_CUST_FAC_D T1,
LEFT JOIN BSLC.TIME_D T2 
  ON T1.DEFAULT_DT >= T2.PERIOD_START_DT AND
     T1.DEFAULT_DT <= T2.PERIOD_END_DT AND
     T2.PERIOD_TYPE = 'MONTH'

WHERE
(T1.RESOLUTION_DT BETWEEN '2008-11-01' AND '2009-10-31')
AND
(T1.RESOLUTION_IND = 'Y');

Instead it looks like a normal SQL statement:
SELECT
T1.COMM_CUST_FAC_KEY, T1.DEFAULT_DT, T1.FAC_TP_CD,
T1.PROD_CD, T1.RESOLUTION_IND, T1.RESOLUTION_DT,
T1.COMM_CUST_KEY, T2.TIME_DIM_KEY, T2.PERIOD_TYPE,
T2.PERIOD_START_DT, T2.PERIOD_END_DT
FROM
BSLC.DFLT_COMM_CUST_FAC_D T1,BSLC.TIME_D T2
WHERE
(T1.DEFAULT_DT >= T2.PERIOD_START_DT)
AND
(T1.DEFAULT_DT <= T2.PERIOD_END_DT)
AND
(T2.PERIOD_TYPE = 'MONTH')
AND
(T1.RESOLUTION_DT BETWEEN '2008-11-01' AND '2009-10-31')
AND
(T1.RESOLUTION_IND = 'Y')

ORDER BY
T1.COMM_CUST_FAC_KEY

FOR FETCH ONLY;

Any ideas regarding this?

Thank you,


Francis


Give me code, or give me retirement. In FOCUS since 1991

Production: WF 7.7.05M, Dev Studio, BID, MRE, WebSphere, DB2 / Test: WF 8.1.05M, App Studio, BI Portal, Report Caster, jQuery, HighCharts, Apache Tomcat, MS SQL Server
 
Posts: 10577 | Location: Toronto, Ontario, Canada | Registered: April 27, 2005Report This Post
Waz
Expert
posted Hide Post
You may have to look at the Master and Access file to determine the Keys, from a FOCUS point of view, also are there any non DB2 tables in the join ?

Does the join return the wrong results ?


Waz...

Prod:WebFOCUS 7.6.10/8.1.04Upgrade:WebFOCUS 8.2.07OS:LinuxOutputs:HTML, PDF, Excel, PPT
In Focus since 1984
Pity the lost knowledge of an old programmer!

 
Posts: 6347 | Location: 33°49'23.0"S, 151°11'41.0"E | Registered: October 31, 2006Report This Post
Francis Mariani
Expert
posted Hide Post
I think I'm addressing all the keys, there are no non-DB2 tables and I think the right results are returned, I just thought the generated SQL would reflect the WebFOCUS Conditional Join.


Francis


Give me code, or give me retirement. In FOCUS since 1991

Production: WF 7.7.05M, Dev Studio, BID, MRE, WebSphere, DB2 / Test: WF 8.1.05M, App Studio, BI Portal, Report Caster, jQuery, HighCharts, Apache Tomcat, MS SQL Server
 
Posts: 10577 | Location: Toronto, Ontario, Canada | Registered: April 27, 2005Report This Post
Waz
Expert
posted Hide Post
What would be interesting to know is which query is more efficient.


Waz...

Prod:WebFOCUS 7.6.10/8.1.04Upgrade:WebFOCUS 8.2.07OS:LinuxOutputs:HTML, PDF, Excel, PPT
In Focus since 1984
Pity the lost knowledge of an old programmer!

 
Posts: 6347 | Location: 33°49'23.0"S, 151°11'41.0"E | Registered: October 31, 2006Report This Post
Tony A
Expert
posted Hide Post
As it's not an OUTER join then I would say the SQL generated is perfectly OK - as your results attest?

However, if you specified an OUTER join then obviously you'd be correct to be concerned.

T


In FOCUS
since 1986		WebFOCUS Server 8.2.01M, thru 8.2.07 on Windows Svr 2008 R2  
WebFOCUS App Studio 8.2.06 standalone on Windows 10 
 
Posts: 5694 | Location: United Kingdom | Registered: April 08, 2004Report This Post
Francis Mariani
Expert
posted Hide Post
Thanks Tony. It is an inner join, I'll keep your comments in mind for an outer join.

Cheers,


Francis


Give me code, or give me retirement. In FOCUS since 1991

Production: WF 7.7.05M, Dev Studio, BID, MRE, WebSphere, DB2 / Test: WF 8.1.05M, App Studio, BI Portal, Report Caster, jQuery, HighCharts, Apache Tomcat, MS SQL Server
 
Posts: 10577 | Location: Toronto, Ontario, Canada | Registered: April 27, 2005Report This Post
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