Hi Osvaldo, Rod, David and Tom
Thanks for your attention. Lastly it is not that difficult.
For me the more natural way is Rod's suggestion, to use replace with where. I don't know why I didn't think of this solution.
The usage of regexp_replace is very nice too and I will take a time to learn it.
Thanks a lot to you all
Antonio
Em sex., 29 de nov. de 2019 às 01:22, Tom Lane <tgl@xxxxxxxxxxxxx> escreveu:
"David G. Johnston" <david.g.johnston@xxxxxxxxx> writes:
> On Thursday, November 28, 2019, Rob Sargent <robjsargent@xxxxxxxxx> wrote:
>> I want to replace a string (not a substring) in a field but making sure
>> that the string in the full field.
> I’d probably do something like:
> Select case when a.col = ‘value’ then ‘new value’ else a.col end from a;
Yeah, this. You could wrap it up in a SQL function if you want the
same level of notational convenience as replace().
Another possibility is regexp_replace with an anchored pattern, but
that would potentially require escaping regexp metacharacters in the
pattern, so the PITA factor is high. And I doubt it'd be faster than
the CASE solution.
regards, tom lane
--
Antônio Olinto Ávila da Silva
Biólogo / Oceanógrafo
Instituto de Pesca (Fisheries Institute)
São Paulo, Brasil
