Обсуждение: find a string contained in an attribute

2010/3/24 Szymon Guz <mabewlun@gmail.com>:
> 2010/3/24 Karina Guardado <kguardado@gmail.com>
>>
>> Hi,
>>
>> I want to know if it is possible to search for a string of characters
>> inside an attribute for example I have the following table and values
>>
>> cod_unidad |                 nombre_uni
>> ------------+---------------------------------------------
>>           1 | Facultad de Ciencias Naturales y Matemática
>>           2 | Facultad de Ciencias Humanidades
>>           3 | Facultad de Ingeniería
>>           4 | Facultad de Agronomía
>>           5 | Oficinas Centrales
>>           6 | test
>>
>>
>> I want to retrieve all the rows where I find the word Ciencias for
>> example. Is there a function or with select is possible to do it?
>>
>> thanks in advance,
>>
>> karina
>> El Salvador, Centroamerica
>
> For example something like this should work:
> SELECT * FROM table WHERE nombre_uni like '%Ciencias%';
> more you can find
> here: http://www.postgresql.org/docs/8.4/interactive/functions-matching.html
> regards
> Szymon Guz

better to use a fulltext it is much faster on tables larger than small

create index foo on tab using gin(to_tsvector('simple', nombre_uni))

select * from tab where to_tsvector('simple', nombre_uni) @@
to_tsquery('simple', 'Ciencias');

Regards
Pavel Stehule

http://www.postgresql.org/docs/8.4/static/textsearch.html

Regards
Pavel Stehule


2010/3/25 Karina Guardado <kguardado@gmail.com>:
> Do you have a link where I can read more about this because is not easy to
> understand.
>
> Thanks for your help,
>
> karina
>
> On Thu, Mar 25, 2010 at 1:34 AM, Pavel Stehule <pavel.stehule@gmail.com>
> wrote:
>>
>> 2010/3/24 Szymon Guz <mabewlun@gmail.com>:
>> > 2010/3/24 Karina Guardado <kguardado@gmail.com>
>> >>
>> >> Hi,
>> >>
>> >> I want to know if it is possible to search for a string of characters
>> >> inside an attribute for example I have the following table and values
>> >>
>> >> cod_unidad |                 nombre_uni
>> >> ------------+---------------------------------------------
>> >>           1 | Facultad de Ciencias Naturales y Matemática
>> >>           2 | Facultad de Ciencias Humanidades
>> >>           3 | Facultad de Ingeniería
>> >>           4 | Facultad de Agronomía
>> >>           5 | Oficinas Centrales
>> >>           6 | test
>> >>
>> >>
>> >> I want to retrieve all the rows where I find the word Ciencias for
>> >> example. Is there a function or with select is possible to do it?
>> >>
>> >> thanks in advance,
>> >>
>> >> karina
>> >> El Salvador, Centroamerica
>> >
>> > For example something like this should work:
>> > SELECT * FROM table WHERE nombre_uni like '%Ciencias%';
>> > more you can find
>> >
>> > here: http://www.postgresql.org/docs/8.4/interactive/functions-matching.html
>> > regards
>> > Szymon Guz
>>
>> better to use a fulltext it is much faster on tables larger than small
>>
>> create index foo on tab using gin(to_tsvector('simple', nombre_uni))
>>
>> select * from tab where to_tsvector('simple', nombre_uni) @@
>> to_tsquery('simple', 'Ciencias');
>>
>> Regards
>> Pavel Stehule
>
>