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Consider the relations: PROJECT(proj#,proj_name,chief_architect) EMPLOYEE(emp#,emp_name) ASSIGNED(proj#,emp#) Use relational algebra to express the subsequent queries:(i) Get details of employees working on project COMP33.(ii) Get the employee number of employees who work on all projects.(iii) Get details of project on which employee with name ‘RAM' is working.
Ans:(i) EMPLOYEE ∏Emp#(σproject#='comp33'(ASSIGNED)) (ii) ∏Emp#(EMPLOYEE)-(ASSIGNED ÷∏project#(PROJECT)) (iii) PROJECT (∏project#(σEmp_name='RAM'(EMPLOYEE) ASSIGNED))
What function divides one numeric expression by another and returns the remainder? MOD function divides one numeric expression by another and returns the remainder.
We require an advanced system for a Sports Centre, you are concerned only with representing the data discussed below about bookings and members. (The complete system may contain ot
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Given the following relations TRAIN (NAME, START, DEST) TICKET (PNRNO., START, DEST, FARE) PASSENGER (NAME, ADDRESS, PNRNO.) Write SQL expressions for the following queries: No
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Foreign Keys and NULL Let us take the relation: DEPT DEPT ID DNAME BUDGET D1 M
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