My problem is that my PL/SQL developer doesn't show UTF8 characters, instead it shows as squares.
- I changed all "NLS_LANG" variable to 'AMERICAN_AMERICA.UTF8' in registry.
- I added my language in region&language from control panel of windows.
- In plsql developer "Tools>preferences>options>Unicode enabled" is checked.
(windows 10 & oracle 11g & plsql developer 9).
what else I missed?