Question: pls give answer in 20 min pls..... (B) Consider the following relational algebra expressions, for each expression, explain in words what the expression does. a.

pls give answer in 20 min pls.....

(B) Consider the following relational algebra expressions, for each expression, explain in words what the expression does. a. attendance>=75( Student ) b. EName, Salary, Dept._Name (Employee) c. \( \Pi_{\text {Emp_id }}\left(\sigma_{\text {Dept_Id }=5}( ight. \) Employee )) Respective tables are as below: Student (Reg._No., Name, Attendance, Marks, Dept._Name) Employee (EName, Emp_id, Salary, Dept._Id)

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