1. my installation:
[EMAIL PROTECTED]:~> uname -a Linux rosetta 2.4.19-4GB #1 Fri Sep 13 13:14:56 UTC 2002 i686 unknown [EMAIL PROTECTED]:~>
mysql> show global variables like "version"; +---------------+----------------+ | Variable_name | Value | +---------------+----------------+ | version | 4.0.12-max-log | +---------------+----------------+ 1 row in set (0.00 sec)
mysql>
mysql> show global variables like "character_set"; +---------------+--------+ | Variable_name | Value | +---------------+--------+ | character_set | latin1 | +---------------+--------+ 1 row in set (0.00 sec)
mysql> show global variables like "character_sets";
+----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Variable_name | Value
|
+----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| character_sets | latin1 big5 czech euc_kr gb2312 gbk latin1_de sjis tis620 ujis dec8 dos german1 hp8 koi8_ru latin2 swe7 usa7 cp1251 danish hebrew win1251 estonia hungarian koi8_ukr win1251ukr greek win1250 croat cp1257 latin5 |
+----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql>
2. my problem:
when i am looking for entries with a name containing an u-umlaut by means of the LIKE construct, i get all chunk result-rows:
mysql> select name from contacts where name like "%�%" order by name; +---------------------------------------------------------------+ | name | +---------------------------------------------------------------+ | A C�te beauty treats | | AA Anonyme Alkoholiker | | AA Anonyme Alkoholiker | | AAA All Activities Agency AG | | Ad�le Uldry | | Adolf Deyhle | | Alain Barbey | | Alain et Doroth�e Ryser | | Alain et Th�r�se Sauty | | Alex et Silvia Fritschy | | Alexandre Stransky | ... ... | Yves Moullet | | Yves Zehfus | | Yves-Andr� et Jennifer Cornioley | | Yves-Fran�ois Weill | | Yves-Pierre Poscia | | Yvonne Badel | | Yvonne Fr�d�rique Maeder | | Yvonne Malka | | Yvonne Quartenoud | | Zekarias Araya | | Zero Gravity | | Z�rich | +---------------------------------------------------------------+ 485 rows in set (0.02 sec)
mysql>
if i, however, do the search with a regexp, it seams to work:
mysql> select name from contacts where name regexp "�" order by name; +---------------------------------------------------------------+ | name | +---------------------------------------------------------------+ | Alfred Z�rcher | | Alig Grossk�chen | | Alois K�hner | | Ambulante Spitex Hausbetreuungsdienst f�r Stadt und Land | | Andreas B�hlmann | | Anton B�hlmann | | Arnd K�chel | | Aur�lia et Yann F�llemann | | Bachbl�tenberatung | | Bahnhofleitung, Fundb�ro, | | Batigroup AG Graub�nden | | Beratungsb�ro f. Personalmanagement | | Bergh�sli | | Beyeler AG Drogerie-Parf�merie | | Brigitte Sch�ller | | B�chi und M�ller AG Beratende Geologen u. Ingenieure SIA/USIC | .... .... | Sprachen f�rs Leben | | S�esswinkel AG | | Thildy M�ller | | Tom�l | | Treuhandb�ro Joachim Schweiger | | Ulrich Rudolph Rothenb�hler | | Verkehrsb�ro | | Vincent et Nootwadee W�rsten | | Walter Bl�chert | | Z�rich | +---------------------------------------------------------------+ 88 rows in set (0.03 sec)
mysql>
in my opinion, the result of the two searches above should be exactly the same. i have found, however, in the docu:
REGEXP and RLIKE use the current character set (ISO-8859-1 Latin1 by default) when deciding the type of a character.
does the LIKE comparison not do that? i.e. is the LIKE comparison bound to pure US-ASCII or to whatever else?
BTW, i have done the above SELECTs not only with u-umlaut but also with a-umlaut, e-accent-grave, e-accent-aigu, a-accent-grave. the results are quite similar to the above example.
3. what am i missing?
thanks for your attention. with the best wishes for X-mas
suomi
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