From: | James David Smith <james(dot)david(dot)smith(at)gmail(dot)com> |
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To: | pgsql-novice(at)postgresql(dot)org |
Subject: | Extract from date field |
Date: | 2011-06-17 11:11:52 |
Message-ID: | BANLkTinbJhDbaQe11zmzm2wuQo--tsn+DQ@mail.gmail.com |
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Lists: | pgsql-novice |
Dear all,
I want to make a primary key for my table based upon a few other
columns. I do this with the following code:
ALTER TABLE camdengps2
ADD COLUMN camdencrimes_link varchar;
UPDATE camdengps2
SET camdencrimes_link='' || EXTRACT(YEAR FROM date_time) || '0' ||
EXTRACT(MONTH FROM date_time) || '' || EXTRACT(DAY FROM date_time) ||
'' || incident
Essentially I am truncating the year, month, day and another field
called 'Incident'. However I am finding two problems with this:
1) I would like the result to be an integer rather than a varchar.
However when I set the field to be integer rather than varchar the SET
query doesn't work. I guess I maybe need to CAST the date as an
integer somehow?
2) When I extract the DAY from the date field, instead of the 2nd of
the month becoming '02' it actually becomes '2'. I would like it to be
'02'.
Any help greatly appreciated...
Best wishes
James
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