Question

Get Max ID

Asked by: chrisryhal

I am trying to get the MAX ID of a column in a table using Progess 4GL.  Has anyone had any experiencing doing so?

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Asked On
2009-09-02 at 04:55:08ID24700930
Tags

Progress

Topic

4GL Databases

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Answers

 

by: progressorPosted on 2009-09-02 at 14:20:16ID: 25245804

What do you want to do exactly?
You can use plain sql92 to query the progress database. I guess you already tried it and are experiencing a problem?
select max(column_name) from pub.<table-name>;
or maybe you can use top like select top 1 .....

Casper.

 

by: chrisryhalPosted on 2009-09-02 at 15:01:03ID: 25246098

Its built into an ERP system (Epicor) so I have to use 4GL and/or create .P procedures

 

by: progressorPosted on 2009-09-02 at 16:51:34ID: 25246796

Sorry, now I see.
If the column is the first field of an index then you can find it by using find first or find last, depending on wether the index is descending or ascending).<TABLE-NAME>
if the column isn't indexed then it is then you have to find it yourself
for instance for a character field you do it like in hte code snippet.

It is clear from this example that searching a maximum value in an unindexed field requires a table scan, which ofcourse is very bad for performance if the table is big.



HTH,

Casper.

define variable cTest as character
for each <table-name> no-lock:
 if cTest = '' or
    cTest < <table-name>.<column-name>
 then assign cTest = <table-name>.<column-name>.
end.
 
message cTest view-as alert-box.

                                              
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by: chrisryhalPosted on 2009-09-02 at 16:57:01ID: 25246820

Casper,

Thanks that rocks.   I need Progress code wrote from time to time if your for hire on a part time basis.  Email me cryhal@ryhal.com

Thanks!
Chris

20120131-EE-VQP-002

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