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Unanswered Questions

• How can make a query return a specific date format?
• Where can I find more information or examples of PL/PGSQL functions?
• why do I get 'ERROR: No such function 'to_number' with the specified attributes' from this select to_number(salary, '999999') from vacancies;
• How can I configure postgresql to use alphabetic character like ñ or ó without getting a ? instead of the character I wrote