R1 and R2 are two Relations as follows: R1(a, b) : { <0,1>, <0, 2>, <2, 3>, <1, 3>} and R2(a, c, d) {

 

R1 and R2 are two Relations as follows: R1(a, b) : { , , , } and R2(a, c, d) { , , , , } What will be the output of the Relational algebra expression give by, c (b-2 (R1 * R2)) * ( means Natural Join) oursehero.com/load_question_attachment.php?q_att_id=40208360&thread_id=128882290