CREATE TABLE table_27666856_3 (date_of_appointment VARCHAR, date_of_vacancy VARCHAR)

Name the date of appointment for 26 may 2011
SELECT COUNT(date_of_appointment) FROM table_27666856_3 WHERE date_of_vacancy = "26 May 2011"
SELECT COUNT("date_of_appointment") FROM "table_27666856_3" WHERE "26 May 2011" = "date_of_vacancy"