This advanced SQL exercise is part of the book: Advanced SQL – Practical Techniques and Use-Cases, which includes 100 day-to-day SQL challenges (and solutions), need-to-know advanced features, and key concepts.
A GPS-based geographical navigation application, manages a table that specifies distances between various destinations. Each row in this table indicates a serial number, starting point, destination, and distance. For example, the distance between point A and point C is 23 kilometers.
CREATE TABLE distances (distance_id int identity(1,1), from_d varchar(25), to_d varchar(25), distance int) GO
