RE: Array help

["Alan Addison" <ahaddison@xxxxxxxx>]

One approach I have used when the data can not be used as the index is to
have three arrays.  One to load, one to sort (Ascend), and one to hold the
summary data (can even be an MODS).  Program initializes  the load array
with high values, then for each index information, looks it up in the load
array.  If not found,  lookup highvalues, and place in that element.
Increment data array/MODS element/occurance with whatever is being
summarized.   Cycle end:  move load array to sort array and do a SORTA.
Then do till high values against elements in sort array:  lookup sort array
element in load array and print data that matches.

-----Original Message-----
From: rpg400-l-admin@midrange.com [mailto:rpg400-l-admin@midrange.com]On
Behalf Of Buck Calabro
Sent: Thursday, September 06, 2001 6:52 PM
To: rpg400-l@midrange.com
Subject: RE: Array help


>I need to count the number of people for each
>age that work within the company

An alternative to arrays is SQL:
select age,count(*) from ... group by age order by 1
fetch each record and do what you need.

Arrays have an advantage if you need to know what ages are not present in
your dataset - the element will be zero.  SQL has an advantage if you need
to do the same sort of calculation on a very diverse dataset like postal
code, where the number of elements would be impractical without developing a
hash function.  It also has an advantage in that you can readily sort the
results by descending count viz.: order by 2 desc.

Buck Calabro
Commsoft; Albany, NY
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