You have the table T = (name, ssn, phone number) representing a person. Each name is uniquely identified by ssn, but the same name can have multiple phone numbers. Suppose you break the tables into two tables T1=(name, ssn) and T2= (name, phone number) a) What are the candidate keys of T, T1, and T2, respectively?

Write a program that queries the world database to determine in which country the residents have the greatest life expectancy. Research how to accomplish a JOIN on two tables. Then write a program that queries the world database to list the population of the capitol city for any country in Asia.

Hi,  This is what I have, but I am stuck with what to write and not sure if my function is even correct, to begin with. Can someone show me a walk-through solution? MUST USE postgreSQL CREATE TABLE instructor_course_nums (ID VARCHAR(25), name VARCHAR(25), tot_courses VARCHAR(25)); CREATE OR REPLACE PROCEDURE calculate_instr_course(ID VARCHAR(25), name VARCHAR(25), tot_courses VARCHAR(25))LANGUAGE plpgsqlAS$$BEGIN END;$$;

Corporation: id 15 17 20 instance: Company: cid id 1 2 3 4 5 15 17 15 20 15 Assumptions: id in Company references id in Corporation. • cid in Department references cid in Company. Department: did cid 1 2 3 4 5 6 7 8 9 10 11 12 5 1 2 2 3 5 1 3 3 1 2 4 Each option starts from the original tables (given above) NOT from the tables modified by the previous option You don't need to copy the entire table. Just explain the action of each operation. (a) Suppose that all the foreign keys are declared using on delete restrict. What is the effect of the instruction delete from Company where cid=2? (b) Suppose that all the foreign keys are declared using on delete cascade. What is the effect of the instruction delete from Corporation where id-15?