Hello PostgreSQL Developers, I could not find a bug report to the functions lower() and upper() on the todo-list. Hopefully it is one, so that you are not bored by old tasks ...
Take a look at the code and the reactions of PostgreSQL: When I try to convert german umlaute, e.g. Ä,Ö,Ü with lower(), I get no lower letters. With upper() it is the same problem vice verser ... All the best from Germany, Hans ghl=# select version(); version --------------------------------------------------------------- PostgreSQL 7.1.3 on i686-pc-linux-gnu, compiled by GCC 2.95.3 (1 row) ghl=# create DATABASE sql_ascii; CREATE DATABASE ghl=# \l List of databases Database | Owner | Encoding -----------+----------+----------- sql_ascii | postgres | SQL_ASCII template0 | postgres | SQL_ASCII template1 | postgres | SQL_ASCII (6 rows) ghl=# \c sql_ascii You are now connected to database sql_ascii. sql_ascii=# select lower('OAU'); lower ------- oau (1 row) sql_ascii=# select lower('ÖÄÜ'); lower ------- ÖÄÜ (1 row) --------------------------------------------------------------------- sql_ascii=# CREATE DATABASE latin1 WITH ENCODING = 'latin1'; CREATE DATABASE sql_ascii=# \l List of databases Database | Owner | Encoding -----------+----------+----------- latin1 | postgres | LATIN1 sql_ascii | postgres | SQL_ASCII template0 | postgres | SQL_ASCII template1 | postgres | SQL_ASCII (7 rows) latin1=# select lower('OAU'); lower ------- oau (1 row) latin1=# select lower('ÖÄÜ'); lower ------- ÖÄÜ (1 row) ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/users-lounge/docs/faq.html