Re: date format

On Wed, Jun 14, 2023 at 8:15 PM Ron <ronljohnsonjr(at)gmail(dot)com> wrote:

> On 6/14/23 13:02, Marc Millas wrote:
>
>
> On Wed, Jun 14, 2023 at 7:27 PM David G. Johnston <
> david(dot)g(dot)johnston(at)gmail(dot)com> wrote:
>
>> On Wed, Jun 14, 2023 at 9:42 AM Marc Millas <marc(dot)millas(at)mokadb(dot)com>
>> wrote:
>>
>>> Hi,
>>>
>>> I would like to load data from a file via file_fdw or COPY.. its a
>>> postgres 14 cluster
>>>
>>> but.. One date (timestamp) column is written french order and another
>>> column is written english order. Data comes from a state owned entity so
>>> asking for a normalization may take ages.
>>>
>>> obviously I could load as char and then apply an appropriate
>>> transformation. no pb.
>>> But is there a direct way to do this ?
>>>
>>
>> Probably no - casting formats via locale cannot be specified at that
>> scope when using copy. Either the cast for a given single setting produces
>> the correct result or it doesn't. If you need a custom cast like this you
>> have to get away from COPY first. Usually that is best done after
>> importing data to a temporary table as text.
>>
>> David J.
>>
>
> So, creating a foreign table with varchar type, and then doing the insert
> as select with the appropriate format.. clear.
> somewhat sad as it was a one step process with the former oracle db we get
> rid off.
>
>
> How did Oracle know what format the date was in?
>
when you describe the external file you describe the field format one by
one.

>
> In Postgresql, could you write a simple anonymous procedure that reads the
> file_fdw table records, does the conversion and then inserts into the
> destination table?
> -> one sql line insert as select using the to_date() function with
> appropriate format.
>
> --
> Born in Arizona, moved to Babylonia.
>