Обсуждение: Searching accented words

Hi!

I have, in the same column, accented words and not.
But I don´t want to worry about it.

Imagine the table Person:
CREATE TABLE PERSON (name TEXT)

INSERT INTO PERSON VALUES ('José')
INSERT INTO PERSON VALUES ('Jose')

The following statement
SELECT * FROM PERSON WHERE NAME like 'José'
would return only the first row, because 'José' is an
accented word.

How can I perform a query that return the two rows, no
matter I pass 'José' or 'Jose' as parameter?

Thanks,
JP

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=?iso-8859-1?q?Jo=E3o=20Paulo=20Batistella?= <batistellabr@yahoo.com.br> writes:
> How can I perform a query that return the two rows, no
> matter I pass 'Jos�' or 'Jose' as parameter?

If your locale is set up correctly, perhaps upper() would return
JOSE for both, and then you could search on upper(name) = 'JOSE'.
(You can make this fast with an index on upper(name).)

            regards, tom lane

On Wed, 2002-07-24 at 21:20, João Paulo Batistella wrote:

 SELECT * FROM PERSON WHERE NAME ilike 'José'

make sure your encoding is set to LATIN9

Cheers

Tony Grant
--
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http://www.animaproductions.com/linux2.html
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On Wed, Jul 24, 2002 at 04:49:09PM -0400,
 Tom Lane <tgl@sss.pgh.pa.us> wrote
 a message of 14 lines which said:

> If your locale is set up correctly, perhaps upper() would return
> JOSE for both,

I would not say it is set up correctly in that case! In French,
upper('Stéphane') is 'STÉPHANE', not 'STEPHANE'.

On Wed, Jul 24, 2002 at 04:20:10PM -0300,
 João Paulo Batistella <batistellabr@yahoo.com.br> wrote
 a message of 29 lines which said:

> How can I perform a query that return the two rows, no
> matter I pass 'José' or 'Jose' as parameter?

A la Altavista, uh? I believe you have to write your own
function. Case-folding fuzzy matching rules are quite dependent on the
language (not on the script, we both use Latin-1, on the
language).

João Paulo Batistella dijo:

> Hi!
>
> I have, in the same column, accented words and not.
> But I don´t want to worry about it.
>
> Imagine the table Person:
> CREATE TABLE PERSON (name TEXT)
>
> INSERT INTO PERSON VALUES ('José')
> INSERT INTO PERSON VALUES ('Jose')
>
> The following statement
> SELECT * FROM PERSON WHERE NAME like 'José'
> would return only the first row, because 'José' is an
> accented word.

I think you have two ways of solving this:

1.  using regular expressions with character classes where an accented
letter is found:
    SELECT * FROM PERSON WHERE name ~* '^Jos[eé]$'
    (note the anchoring to make it equivalent to the absence of % in
    LIKE)

2.  using a function to convert the accented letters in strings.  Then
use it like
    SELECT * FROM PERSON WHERE drop_accents(name) LIKE
    drop_accents('José')

--
Alvaro Herrera (<alvherre[a]atentus.com>)
"El hombre nunca sabe de lo que es capaz hasta que lo intenta" (C. Dickens)