Question

Which of the following types of joins refers to results consisting of each row from the first table being replicated from every row in the second table?

a) Inner Join

b) Cross Join

c) Outer Join

d) Self Join

Answer 1

The correct answer is Cross Join. A cross join combines each row from the first table with every row from the second table, resulting in a combination of all possible pairs.

Step-by-step explanation:

The correct answer is Cross Join. A cross join, also known as a cartesian product, combines each row from the first table with every row from the second table, resulting in a combination of all possible pairs. This means that the number of rows in the result set is equal to the number of rows in the first table multiplied by the number of rows in the second table.

For example, if Table A has 3 rows and Table B has 2 rows, the cross join will produce 3 multiplied by 2, resulting in 6 rows in the result set.

Cross joins are useful in situations where you want to generate all possible combinations between two tables or when you want to generate a Cartesian product.