Hi Stan
in you code sample there are "(" mis-matched, "MAX(" matches to "= project_key)";
it should be
MAX(NULLIF(regexp_replace(report_no, '\D','','g'), '')::numeric)
I do exactly what you do, and you are correct sequences are not a good fit
I typically do something like this for
select 'username' || 'more text' || Max(count)+1::text from myreport_counter_table group by userName, report_id where userName = 'the user ' and report_id = 12
I am trying to create a function to automatically create a reference value
when a record is inserted into a table. I want the reference value to
consist of the user that is doing the insert, plus a couple of dates, plus
a sequence number, where the sequence number will increment every time a
given user inserts a record. because this sequence number is user specific,
my first thought is not to use a set of sequences for it, but to do this by
selecting the maximum sequence number that user has entered in the past.
So, I have a function that gets all the data, and concatenates it into a
string with the exception of the sequence. For that component, I have the
following test select that works.
SELECT NULLIF(regexp_replace(report_no, '\D','','g'), '')::numeric AS result
FROM
expense_report_instance
WHERE
/* NEW.project_key */ 123 = project_key;
But, when I add the requisite MAX clause, I get a syntax error.
SELECT MAX(NULLIF(regexp_replace(report_no, '\D','','g'), '')::numeric
FROM
expense_report_instance
WHERE
/* NEW.project_key */ 123 = project_key);
Is there a way I can make this work?
--
"They that would give up essential liberty for temporary safety deserve
neither liberty nor safety."
-- Benjamin Franklin