Re: update field using substrings of another field

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От Andreas Fromm
Тема Re: update field using substrings of another field
Дата
Msg-id 3F672294.8070201@physik.uni-erlangen.de
обсуждение исходный текст
Ответ на update field using substrings of another field  ("Dave [Hawk-Systems]" <dave@hawk-systems.com>)
Список pgsql-general
Wouldn't it be the correct way to do such things just on retrieve of the
data, i.e. to implement the formatted output on the appication layer, or
maybe via a View, so that you don't save the data twice?

Doug McNaught wrote:

>"Dave [Hawk-Systems]" <dave@hawk-systems.com> writes:
>
>
>
>>Have a table with fnumber and number, both text
>>fnumber is a phone number, format "8005551212"
>>number needs to be the same number but in the format "(800) 555-1212"
>>
>>we currently run the following each time the list is updated;
>>update pnums set number='(' || substring(fnumber from 1 for 3) || ') ' ||
>>substring(fnumber from 4 for 3) || '-' || substring(fnumber from 7 for 4);
>>
>>is there a way to statically set that number field so that it always
>>equals the fnumber in that format, or automatically updates itself
>>when the fnumber field is changed?
>>
>>
>
>You could do it fairly easily with a trigger.
>
>-Doug
>
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--
Andreas Fromm

-----------------------------
Drink wet cement...
           ... and get stoned




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