## Which of the following operations are binary operations in relational algebra?

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**Question:**

**3. Which of the following operations are binary operations in relational algebra?**

(a) Projection

(b) Union

(c) Cartesian Product

(d) Rename

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**Answer:**

**(b) Union and (c) Cartesian product**

**Binary operations**are operations that are having two operands. For example, in A U B, A and B are operands and U is operation. (Π_{cname}(Customer))U(Π_{cname}(CPhone)) is an union operation between two relational algebra expressions.**Projection and Rename**operations are Unary operations involving only one relation as operand.

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