Write a relational algebra expression that returns memebers name and the average number of days they borrowed books for

Write a relational algebra expression that returns member names that on average borrow books for the longest period

Write a relational algebra expression that returns the staff names that served all the members

Staff Reservation sID sName Joan S1 blo mld sld Quantity numberOfDays Status b1 M2 si 1 1 Closed 2 PassDue M1 53 | s2 b2 M3 S1 Pam Greg In S3 b2 2 Closed Member Book mID M1 mName Sam IM2 Paul blDbTittle numberOfCopyCategorybAuthor b1 Algorithm 2 Math Aline b2 Database 3 CS Sean b3 Gone with 4 Fiction John the wind M3 Ron M4 Laura