2. Show the results of the following operations given in relational algebra. A a1 a2 a3 a4 2 3 4 1. 8 12 5 4 2 12 4 B b1 b2 b3 2. 4 3 4 12 11 4 2 11 c1 c2 4 4 4 4 12 4 7 7 7 12 Ax(OB.b2>10B) 1. 2. AA.a3-B.b2 B AX A.a4=B.b3 3. AN (A.a1=B.b1 AND A.a3=B.b2) B 4.

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