Re: Date conditioned SQL Select

[rob@xxxxxxxxx]

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_Change?OpenForm

Rob Berendt