Show the number of card types.
CREATE TABLE Customers_Cards (card_type_code VARCHAR)
SELECT COUNT(DISTINCT card_type_code) FROM Customers_Cards
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE Customers_Cards (card_type_code VARCHAR) Question: Show the number of card types. [/INST] SELECT COUNT(DISTINCT card_type_code) FROM Customers_Cards </s>