CREATE TABLE table_name_45 (date_of_vacancy VARCHAR, date_of_appointment VARCHAR)

What was the vacancy date of the manager appointed on 11 March 2010?
SELECT date_of_vacancy FROM table_name_45 WHERE date_of_appointment = "11 march 2010"
SELECT "date_of_vacancy" FROM "table_name_45" WHERE "11 march 2010" = "date_of_appointment"