4. Let A(x), B(x) and C(x) be three unary relation schemas that repre- sent sets A, B and C of integers. Give answers to the following problems. You should provide two differ- ent SQL queries. One answer wherein you can use the set operations INTERSECT and/or EXCEPT, and a second answer wherein you can not use these operators. You can use user-defined functions but you can not use aggregate functions. (a) Determine the truth-value of A n B 0. For example, if A = 1,2 and B 1,4,5) then the result of your SQL statements should be answer (1 row) If, however, A-1,2] and B-3,4) then the result of your statement should be answer (1 row) (b) Determine the truth-value of AC B (c) Determine the truth-value of An B-B (d) Determine the truth-value of A B (e) Determine the truth-value of An B 2. (f) Determine the truth-value of (AU B)CC (g) Determine the truth-value of |(A - B) U(B - C) 1 You are permitted to uset the UNION operator 4. Let A(x), B(x) and C(x) be three unary relation schemas that repre- sent sets A, B and C of integers. Give answers to the following problems. You should provide two differ- ent SQL queries. One answer wherein you can use the set operations INTERSECT and/or EXCEPT, and a second answer wherein you can not use these operators. You can use user-defined functions but you can not use aggregate functions. (a) Determine the truth-value of A n B 0. For example, if A = 1,2 and B 1,4,5) then the result of your SQL statements should be answer (1 row) If, however, A-1,2] and B-3,4) then the result of your statement should be answer (1 row) (b) Determine the truth-value of AC B (c) Determine the truth-value of An B-B (d) Determine the truth-value of A B (e) Determine the truth-value of An B 2. (f) Determine the truth-value of (AU B)CC (g) Determine the truth-value of |(A - B) U(B - C) 1 You are permitted to uset the UNION operator