Re: How to allow null as an option when using regexp_matches?
| От | Shaozhong SHI |
|---|---|
| Тема | Re: How to allow null as an option when using regexp_matches? |
| Дата | |
| Msg-id | CA+i5Jwb0A=_Uh+CbAm9qeXC5otc1fWWEUsPqA8Ci4cng3qTgdw@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: How to allow null as an option when using regexp_matches? (Karsten Hilbert <Karsten.Hilbert@gmx.net>) |
| Ответы |
Re: How to allow null as an option when using regexp_matches?
|
| Список | pgsql-general |
Hi, Karsten,
That sounds interesting.
Any good example?
Regards, David
On Wed, 8 Dec 2021 at 12:10, Karsten Hilbert <Karsten.Hilbert@gmx.net> wrote:
Am Wed, Dec 08, 2021 at 12:07:13PM +0000 schrieb Shaozhong SHI:
> We can do this:
> select count(*) from regexp_matches('Great London', 'Great
> London|Information Centre|Department for Transport', 'g');
>
> Is it possible to allow null as an option? something like this
> select count(*) from regexp_matches('Great London', 'null|Great
> London|Information Centre|Department for Transport', 'g');
You seem to want to apply coalesce() judiciously.
Best,
Karsten
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