CREATE TABLE table_27091128_2 (date_of_appointment VARCHAR, replaced_by VARCHAR)

What was date of appointment for Erg n Penbe?
SELECT date_of_appointment FROM table_27091128_2 WHERE replaced_by = "Ergün Penbe"
SELECT "date_of_appointment" FROM "table_27091128_2" WHERE "Ergün Penbe" = "replaced_by"