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, population__2011_census_ VARCHAR )

### Question ###
What's the code of the district in which 312520 people lived in 2011?

### Accurate SQL ###

SELECT code FROM table_2801442_1 WHERE population__2011_census_ = 312520