Solution

The correct answer is 16

Key PointsIn the context of relational databases and SQL, a Cartesian product (or CROSS JOIN) refers to a JOIN operation that returns the combination of every row of the first table with every row of the second table.

If table1 has n rows and table2 has m rows, the Cartesian product of these two tables will result in a table with n*m rows.

If table1 has 4 rows and table2 has 4 rows, the Cartesian product of these two tables will result in a table with 4*4 = 16 rows.

So the correct answer is 16