Обсуждение: Date Math

Hi,

I am trying to modify some timestamps in the database and cannot find
documentation relating to date/timestamp manipulation.

What I am thinking of something like:

update foo set  timestamp_field  = timestamp_field + 365;

where the 365 is days, or seconds or something.

Any hints?

Thanks
john

Try:

update foo set  timestamp_field  = timestamp_field + '365
days'::interval;


John Goetsch wrote:
>
> Hi,
>
> I am trying to modify some timestamps in the database and cannot find
> documentation relating to date/timestamp manipulation.
>
> What I am thinking of something like:
>
> update foo set  timestamp_field  = timestamp_field + 365;
>
> where the 365 is days, or seconds or something.
>
> Any hints?
>
> Thanks
> john
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org

Or maybe you wanted :

update foo set abstime_field = abstime_field + '1 year'::reltime;

;^)

I normaly use 'abstime' and 'reltime' for dates and intervals, the major
difference is 'timestamp' has microsecond time accuracy, but abstime
takes less storage space IIRC.

Guy

Jean-Luc Lachance wrote:

>Try:
>
>update foo set  timestamp_field  = timestamp_field + '365
>days'::interval;
>
>
>John Goetsch wrote:
>
>
>>Hi,
>>
>>I am trying to modify some timestamps in the database and cannot find
>>documentation relating to date/timestamp manipulation.
>>
>>What I am thinking of something like:
>>
>>update foo set  timestamp_field  = timestamp_field + 365;
>>
>>where the 365 is days, or seconds or something.
>>
>>Any hints?
>>
>>Thanks
>>john
>>
>>---------------------------(end of broadcast)---------------------------
>>TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org
>>
>>
>
>---------------------------(end of broadcast)---------------------------
>TIP 6: Have you searched our list archives?
>
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>
>
>
>