Tag: Leetcode SQL:

1581. Customer Who Visited but Did Not Make Any Transactions SQL Code: SELECT customer_id, COUNT(*) FROM Visits v WITH (NOLOCK) LEFT JOIN Transactions t WITH (NOLOCK) ON v.visit_id = t.visit_id WHERE t.transaction_id IS NULL GROUP BY customer_id; Explanation: *SELECT customer_id, COUNT()**: This line specifies that we want to retrieve the…