From: | merlyn(at)stonehenge(dot)com (Randal L(dot) Schwartz) |
---|---|
To: | "Brian C(dot) Doyle" <bcdoyle(at)mindspring(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Function Help |
Date: | 2001-09-25 00:29:19 |
Message-ID: | m1bsk0ru3k.fsf@halfdome.holdit.com |
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Thread: | |
Lists: | pgsql-general |
>>>>> "Brian" == Brian C Doyle <bcdoyle(at)mindspring(dot)com> writes:
Brian> Hello all,
Brian> I am working on a function to determine the date of the first saturday
Brian> of the month.
Brian> Currently I have:
Brian> CREATE FUNCTION first_saturday(date)
Brian> RETURNS date
Brian> AS '
Brian> Select CASE WHEN date_part(\'dow\',\'$1\'::DATE)=0 THEN date(\'$1\')+6
Brian> WHEN date_part(\'dow\',\'$1\'::DATE)=1 THEN date(\'$1\')+5
Brian> WHEN date_part(\'dow\',\'$1\'::DATE)=2 THEN date(\'$1\')+4
Brian> WHEN date_part(\'dow\',\'$1\'::DATE)=3 THEN date(\'$1\')+3
Brian> WHEN date_part(\'dow\',\'$1\'::DATE)=4 THEN date(\'$1\')+2
Brian> WHEN date_part(\'dow\',\'$1\'::DATE)=5 THEN date(\'$1\')+1
Brian> WHEN date_part(\'dow\',\'$1\'::DATE)=6 THEN date(\'$1\')+0
Brian> END'LANGUAGE 'sql'
Brian> I get an error that $1 is not a valid date. But I want that to be the
Brian> variable I enter...
Brian> what Am I doing wrong???
Working too hard? :)
why not just:
My_Col + 6 - date_part('dow', My_Col)
Don't even need a function for that. :)
--
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn(at)stonehenge(dot)com> <URL:http://www.stonehenge.com/merlyn/>
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