Assertion. The join, in which columns are compared for equality, is called an Equi-join.

Reason. In non-equi joins, the columns are compared with non-equality conditional operators.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Both A and R are true but R is not the correct explanation of A.

Explanation
The join in which columns are compared for equality is called an Equi-join. A non-equi-join involves comparing columns with non-equality conditional operators, such as '<>', '<', '>', '<=', and '>=', to specify relationships other than equality between the columns.