Postgres upper function on turkish character does not return expected result

Question

It looks like postgres upper/lower function does not handle select characters in Turkish character set.

select upper(\'Aaı\'), lower(\'Aaİ\') from          


        

Answer 1

It seems to me that your problem is related to Windows. This is how it looks on Ubuntu (Postgres 8.4.14), database encoding UTF-8:

test=# select upper('Aaı'), lower('Aaİ');
 upper | lower
-------+-------
 AAI   | aai
(1 row)

My recommendation would be - if you have to use Windows - to write a stored procedure that will do the conversion for you. Use built-in replace: replace('abcdefabcdef', 'cd', 'XX') returns abXXefabXXef. There might be a more optimal solution, I do not claim that this approach is the correct one.