CREATE TABLE table_24231638_3 (position_in_table VARCHAR2, date_of_vacancy VARCHAR2)

How many times was the date of vacancy 14 february 2011?
SELECT COUNT(position_in_table) FROM table_24231638_3 WHERE date_of_vacancy = "14 February 2011"
SELECT COUNT("position_in_table") FROM "table_24231638_3" WHERE "14 February 2011" = "date_of_vacancy"