What is the name of the shipping agent of the document with id 2?
CREATE TABLE Documents (
    Id VARCHAR
)

CREATE TABLE Ref_Shipping_Agents (
    Id VARCHAR
)
SELECT Ref_Shipping_Agents.shipping_agent_name FROM Ref_Shipping_Agents JOIN Documents ON Documents.shipping_agent_code = Ref_Shipping_Agents.shipping_agent_code WHERE Documents.document_id = 2
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the name of the shipping agent of the document with id 2? ### Input: CREATE TABLE Documents (
    Id VARCHAR
)

CREATE TABLE Ref_Shipping_Agents (
    Id VARCHAR
) ### Response: SELECT Ref_Shipping_Agents.shipping_agent_name FROM Ref_Shipping_Agents JOIN Documents ON Documents.shipping_agent_code = Ref_Shipping_Agents.shipping_agent_code WHERE Documents.document_id = 2