RE: Re: Date conditioned SQL Select -- RPG400-L

Are you saying that the sql statement below actually work?
Select * from filename where filedate=(userdate + 19000000)

I thought it needs to be  
Select * from filename where filedate+19000000=userdate

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of klerpg@xxxxxxxxxxxxx
Sent: Tuesday, September 12, 2006 1:46 PM
To: RPG programming on the AS400 / iSeries
Subject: Re: Re: Date conditioned SQL Select

Rob, 

Thanks for the assist - actually, it was a simple, old "Y2K fix" that
solved the problem:

Select * from filename where filedate=(userdate + 19000000)
 
So... 
1060911 + 19000000 = 20060911 

How quickly I forgot something so basic, and boring, and mind-numbingly
repititious from the months leading up to the big "Y2K Disaster"!

Thanks again!


From: rob@xxxxxxxxx
Date: 2006/09/12 Tue AM 10:15:35 EDT
To: RPG programming on the AS400 / iSeries <rpg400-l@xxxxxxxxxxxx>
Subject: Re: Date conditioned SQL Select

Frankly I like the way RPG handles date manipulation better than SQL.

And while we can enhance SQL by using UDF's and our RPG it would be 
better if SQL were enhanced.  Actually, the idea solution would be to 
stop using numeric fields to store dates.  Another good case where a 
DBA could slap the fellow silly that still creates files with numeric 
dates.  But, getting back to RPG vs SQL...  Take this example:
     d DateCYMD        s              7p 0 inz(1060901)
     d DateISO         s              8p 0 inz(20060915)
     d Spread          s              5i 0
      /free
       Spread =

%diff(%date(DateISO:*ISO):%date(DateCYMD:*CYMD):*days);

       dsply spread;  // Value displayed was +14
       *inlr=*on;
       return;
      /end-free

Now, to do this in SQL would require a lot of manipulation of that 
silly cymd date.  Something like
     d InputDate       s              8p 0 inz(20060915)
     d InputTrue       s               d
     d InputDays       s              5i 0
      /free
        // Do as much calculation as possible OUTSIDE of the cursor so
        // as not to repeat the calculation on each row.
       InputTrue=%date(InputDate:*ISO);
       exec sql Set :InputDays = days(InputTrue);
       exec sql Declare C1 cursor for
         Select Amt
         From klerpg
         Where :InputDays - days(
and here is where it gets tricky and I just don't have the time to do 
a good sample.  I recommend you create a UDF to do this:
http://faq.midrange.com/data/cache/185.html

And submit a DCR to IBM to get them to enhance SQL.
https://www-912.ibm.com/r_dir/ReqDesChange.nsf/Request_for_Design_Chan
ge?OpenForm

Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





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Subject
Date conditioned SQL Select






All:

I have a file that I need to read based on a user-input date field 
(CCYYMMDD). The file field I am comparing to is a 7 digit date field 
(CYYMMDD).

In SQL, how do I get the select statement to pull records based on a 
comparison of these two fields?

TIA

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