Re: Learning qsort

Well as long as we're talking about alternatives to SORTA, don't forget the
good old
https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_74/apis/QLGSORT.htm API.
It provides for multiple sort keys and sorting of an input buffer (like a
RPG array) in addition to sorting of tables/files.

On Fri, Dec 13, 2019 at 7:57 PM Jon Paris <jon.paris@xxxxxxxxxxxxxx> wrote:

The example of mine that you linked uses a single procedure to achieve a
three key sort.

You basically need one procedure for each desired key sequence.

If you have two keys the worst case scenario is 2 procedures, A in B, and
B in A. Unless you also need A only and B only. That would be four
procedures but could be achieved by just two and short circuit logic when a
single key was needed.

But realistically you probably never need all possible combinations
because many seances would be meaningless. For example Phone number in
Name in State is pretty useless I would think.

On Dec 13, 2019, at 5:34 PM, Booth Martin <booth@xxxxxxxxxxxx> wrote:

Trying to get my head around qsort. Looks promising, and people I

respect say it's the right answer.

Here is my practice piece:

* 2-columns (State & City)
o sort by State, up or down
o sort by City, up or down
* always maintain the original order of the "other" column.

That looks to me like I'll want _8_ procedures? 3 columns would need

_16_ procedures? Methinks I have badly misunderstood something and best
stop and ask questions.

(I am using Jon's quite clear article as a learning guide. qsort: A

Better SORTA <https://www.itjungle.com/2012/01/25/fhg012512-story02/> )

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