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_72 (density__hab_km²_ VARCHAR, city_district VARCHAR)

### Question ###
What is the density of San Sebastián?

### Accurate SQL ###

SELECT density__hab_km²_ FROM table_name_72 WHERE city_district = "san sebastián"