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_name_27 ( flattening_ratio VARCHAR, equatorial_diameter VARCHAR )

### Question ###
What is the Flattening ratio associated with the Equatorial diameter of 12,756.28km?

### Accurate SQL ###

SELECT flattening_ratio FROM table_name_27 WHERE equatorial_diameter = "12,756.28km"