ibm midrange - To function or not to function, that is the question at hand -

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i working on sql statements asp.net application. 1 of things required display information in open period. period updated automatically vendor software previous period closed. finding myself doing bunch of sub selects like:

where date >= (select date(concat('20', concat(yy, concat('-', concat( mm, (concat('-', dd))))))) lib/file')

yes, each portion of date in separate fields.

would making query function make query more efficient? have never created function before how that? thought having like:

isinrange(date)

so can where isinrange(date).

or there better way?

create function todate(yy char(2), mm char(2), dd char(2)) returns date return date('20' || '-' || yy || '-' || mm || '-' || dd) 
select * table date <= todate(yy, mm, dd)

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