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 staff (last_name VARCHAR, email_address VARCHAR)

### Question ###
Find the last name of the staff whose email address contains "wrau".

### Accurate SQL ###

SELECT last_name FROM staff WHERE email_address LIKE "%wrau%"