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_2801442_1 ( code VARCHAR, density_in_2011___km²_ VARCHAR )

### Question ###
What's the code of the district with 800.5 people per km2?

### Accurate SQL ###

SELECT code FROM table_2801442_1 WHERE density_in_2011___km²_ = "800.5"