Relational algebra for banking scenario

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小蘑菇
小蘑菇 2020-11-22 08:30

I don\'t know how to solve the relational algebra questions.

Deposit (Branch, Acc-No, Cust-Name, Balance)
Loan (Branch, Loan-No, Cust-Name, Bala         


        
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  •  深忆病人
    2020-11-22 08:38

    This is the answer I came up with:

    π Branch, Cust-Name, Balance, Acc-No, (σ Balance < 100^branch=”Romford”  (Deposit)) 
    ∪ 
    π Branch, Cust-Name, Balance, Loan-No, (σ Balance > 2500 ^branch=”Romford”(Loan))
    

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