What is use of cross-join in Sql

Question

Vishal Yelve · Answer

CROSS JOIN , produces the cartesian product of the 2 tables involved in the join. For example, in the Employees table, we have 10 rows and in the Departments table, we have 4 rows. So, a cross join between these 2 tables produces 40 rows. Cross Join shouldn't have an ON clause. Another Example Consider you have a Car table that holds model information Car(Make, Model) and AvaliableColorOption(Color) All available car options can be achieved by cross-join. Car table: 1. Benz C-Class 2. Benz S-Class AvaliableColorOption: 1. Red 2. Green The Cartesian Product of the tables will yield: 1. Benz C-Class Red 2. Benz S-Class Red 3. Benz C-Class Green 4. Benz S-Class Green

Rajanikant Hawaldar · Answer

https://www.c-sharpcorner.com/blogs/cross-join-in-sql https://www.c-sharpcorner.com/UploadFile/ff0d0f/joins-in-sql-server/ https://www.c-sharpcorner.com/UploadFile/219d4d/joins-in-sql-server/

Amit Mohanty · Answer

The CROSS JOIN is used to generate a paired combination of each row of the first table with each row of the second table. It is useful when you need all combinations. It maps each row of the first table with all the rows from the second table. For more details check the links. https://stackoverflow.com/questions/219716/what-are-the-uses-for-cross-join https://www.scaler.com/topics/cross-join-in-sql/

Brahma Prakash Shukla · Answer

CROSS JOINs are used to combine each row of one table with each row of another table, and return the Cartesian product of the sets of rows from the tables that are joined.