Show the description of the transaction type that occurs most frequently.
CREATE TABLE Ref_Transaction_Types (
    transaction_type_description VARCHAR,
    transaction_type_code VARCHAR
)

CREATE TABLE TRANSACTIONS (
    transaction_type_code VARCHAR
)
SELECT T1.transaction_type_description FROM Ref_Transaction_Types AS T1 JOIN TRANSACTIONS AS T2 ON T1.transaction_type_code = T2.transaction_type_code GROUP BY T1.transaction_type_code ORDER BY COUNT(*) DESC LIMIT 1
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: Show the description of the transaction type that occurs most frequently. ### Input: CREATE TABLE Ref_Transaction_Types (
    transaction_type_description VARCHAR,
    transaction_type_code VARCHAR
)

CREATE TABLE TRANSACTIONS (
    transaction_type_code VARCHAR
) ### Response: SELECT T1.transaction_type_description FROM Ref_Transaction_Types AS T1 JOIN TRANSACTIONS AS T2 ON T1.transaction_type_code = T2.transaction_type_code GROUP BY T1.transaction_type_code ORDER BY COUNT(*) DESC LIMIT 1