Please run the sql lines in SQL Editor as "hr" user;
e.g.
select CONCAT('Bilgi havuzu ','at ozsoyler.blogspot.com') from dual;
result
Bilgi havuzu at ozsoyler.blogspot.com
Used database user: hr
Used database server: oracle xe
e.g.
select CONCAT('Bilgi havuzu ','at ozsoyler.blogspot.com') from dual;
result
Bilgi havuzu at ozsoyler.blogspot.com
Used database user: hr
Used database server: oracle xe