Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_27495117_3 ( team VARCHAR, date_of_appointment VARCHAR )

### Question ###
how many teams had an appointment date of 11 april 2011

### Accurate SQL ###

SELECT COUNT(team) FROM table_27495117_3 WHERE date_of_appointment = "11 April 2011"