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 Document_locations ( location_code VARCHAR )

### Question ###
What are the different location codes for documents?

### Accurate SQL ###

SELECT DISTINCT location_code FROM Document_locations