# week14 - If we do R(X R what happens Division b1 b2 R=R8R...

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If we do R (X) R, what happens? R = R 8 R Division ( ÷ ) R1 (A,B) R2 (B) a 1 b 1 a 1 b 2 a 2 b 1 a 3 b 1 a 4 b 2 a 5 b 1 a 5 b 2 b 1 Both Not in the second b 2 R = R1 ÷ R2 R (A) a 1 a 5 If R2 (B) R = R1 ÷ R2 R (A) b 1 a 1 a 2 a 3 a 5 If R2 (B) R = R1 ÷ R2 R (A) b 1 b 2 b 3 If R2 (B) R = R1 ÷ R2 R (A) a 1 a 2 a 3 a 4 a 5

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Employee (ENo , EName) Assigned_To (ENo , PNo , Hours) Project (PNo , PName, Architect) Q1. Display Emp No of employees working for the Project P1 π Eno ( τ PNo = ‘pi’ (Assigned_To)) Q2. Display Emp No and Emp Name of employees working for the Project P1 Employee 8 π Eno ( τ Pno = ‘pi’ (Assigned_To)) Q3. Display ENo and EName of employees workng for Project named “Database” π ENo, EName {Employee 8 π Eno [(Assigned_To 8 ( π Eno ( τ PName = ‘Database’ (Project))]} Q4. Display ENo and EName of employees working on both project P1 and P2
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week14 - If we do R(X R what happens Division b1 b2 R=R8R...

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