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_25595107_2 ( sail_number VARCHAR, loa__metres_ VARCHAR )

### Question ###
What is the number of the sail with an overall length of 13.68?

### Accurate SQL ###

SELECT sail_number FROM table_25595107_2 WHERE loa__metres_ = "13.68"