What is the customer id with most number of cards, and how many does he have?
CREATE TABLE Customers_cards (customer_id VARCHAR)
SELECT TOP 1 customer_id, COUNT(*) FROM Customers_cards GROUP BY customer_id ORDER BY COUNT(*) DESC
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE Customers_cards (customer_id VARCHAR) Question: What is the customer id with most number of cards, and how many does he have? [/INST] SELECT TOP 1 customer_id, COUNT(*) FROM Customers_cards GROUP BY customer_id ORDER BY COUNT(*) DESC </s>