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 Ref_Shipping_Agents (shipping_agent_code VARCHAR, shipping_agent_name VARCHAR)

### Question ###
What is the shipping agent code of shipping agent UPS?

### Accurate SQL ###

SELECT shipping_agent_code FROM Ref_Shipping_Agents WHERE shipping_agent_name = "UPS"