Re: Fixing faulty dates - select on day part of a date field

On Thu, 2001-11-29 at 12:31, Gary Stainburn wrote:
> I've got a problem with dates on one of my tables. I've been inserting dates
> in the format 'dd/mm/ccyy' which for the days 13-31 for each month worked
> fine.
>
> The problem I have is that for the days 01-12 for each month, the date was
> interpretted as 'mm/dd/ccyy'. Now I know about it I need to fix it.
>
> Two questions.
>
> 1) how can I select on part of a date? I need to select all records where
> the day is not > 12.

select date_part('part', attribute)

where part is one of week, day, year ans so on

standards compliant way is

select extract(part from attribute)

so:

select * from table where date_part('day', attribute) < 13;

> 2) can I do this in a single update, i.e. can I do something around
>
> update calls set xdate = ???? where ??????;

What exactly do you want to achieve?

Markus Bertheau