Please answer this DBMS ques asap! Suppose that we have three relations R1={A, B, C}, R2={A, B, D} and R3={B, C, D} under the relational data model. The relation R1 has 5 tuples, the relation R2 has 6 tuples and the relation R3 has 7 tuples. There are no NULL values in these relations. For each of the following relational algebra expressions, list the minimum and maximum numbers of tuples in the result that the relational algebra expression may have. (1) πA,B(R1) (2) R2 × πB(R3) (3) πB(R2) ∪ πB(R3)
Please answer this DBMS ques asap!
Suppose that we have three relations R1={A, B, C}, R2={A, B, D} and R3={B, C, D} under the relational data model. The relation R1 has 5 tuples, the relation R2 has 6 tuples and the relation R3 has 7 tuples. There are no NULL values in these relations.
For each of the following relational algebra expressions, list the minimum and maximum numbers of tuples in the result that the relational algebra expression may have.
(1) πA,B(R1)
(2) R2 × πB(R3)
(3) πB(R2) ∪ πB(R3)
(4) R1 ⋈ R2
(5) ρX (R2) ⋈X.B≠Y.B ρY (R2)
(1) max=____ , min=____ ;
(2) max=____ , min=____ ;
(3) max=____ , min=____ ;
(4) max=____ , min=____ ;
(5) max=____ , min=____ ;
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Please answer this DBMS ques asap!
Suppose that we have three relations R1={A, B, C}, R2={A, B, D} and R3={B, C, D} under the relational data model. The relation R1 has 5 tuples, the relation R2 has 6 tuples and the relation R3 has 7 tuples. There are no NULL values in these relations.
For each of the following relational algebra expressions, list the minimum and maximum numbers of tuples in the result that the relational algebra expression may have.
(4) R1 ⋈ R2
(5) ρX (R2) ⋈X.B≠Y.B ρY (R2)
You can use the following format to organise your answers.
(5) max=____ , min=____ ;
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