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_46 ( population__2004_est_ VARCHAR, hanzi VARCHAR )

### Question ###
What is the 2004 population for ?

### Accurate SQL ###

SELECT population__2004_est_ FROM table_name_46 WHERE hanzi = "山海关区"