4. Control questions

Please, give answers to the following questions:

5. Appendix a. Answer to the lab task

Please formulate SQL SELECT statements that correspond to the following queries:

Simple embedded queries

1. Display departments that are located in the same building as informatics faculty

SELECT Name

FROM DEPARTMENT

WHERE Building = (SELECT Building

FROM FACULTY

WHERE Name = 'Computer Science');

2. Display faculties that have fund less than fund of ASU department:

SELECT Name

FROM FACULTY

WHERE Fund <(SELECT Fund

FROM DEPARTMENT

WHERE Name = 'ASU');

The same table in parent and embedded query:

3. Display teachers that have the same salary+increment more that have of Ivanov:salary + increment:

SELECT Name

FROM TEACHER

WHERE Salary + Increment + 100 > (SELECT (Salary + Increment) / 2

FROM TEACHER

WHERE Name = 'Иванов');

Correlated subqueries in WHERE clause

4. Display faculties that have departments in building 5

SELECT Name

FROM FACULTY

WHERE 5 IN (SELECT Building

FROM DEPARTMENT

WHERE FACULTY.#F = DEPARTMENT.#F);

5. Display teachers that have more than 3 lectures in the 1^st week:

SELECT Name

FROM TEACHER

WHERE 3 < (SELECT COUNT(*)

FROM LECTURE

WHERE LECTURE.#T = TEACHER.#T AND Week = 1);

6. Display buildings that have only one faculty:

SELECT Building

FROM FACULTY F1

WHERE 1 = (SELECT COUNT ( Building)

FROM FACULTY F2

WHERE F1.Building = F2.Building);

Using EXISTS in WHERE clause:

7. Select teaches that have at least one lecture:

SELECT Name

FROM TEACHER

WHERE EXISTS (SELECT *

FROM LECTURE

WHERE LECTURE.#T = TEACHER.#T);

8. Select teaches-professors that are not curators of first year groups

SELECT Name

FROM TEACHER

WHERE Post = professor AND

NOT EXISTS (SELECT * FROM GROUP

WHERE GROUP.#Curator = TEACHER.#T AND Course = 1);

Usage ANY, SOME and ALL.

9. Display teachers of ASU department that have salary less at least one teacher of CS department

SELECT Name

FROM TEACHER T, DEPARTMENT D

WHERE T.#D = D.#D AND D.Name = 'ASU' AND

Salary + Increment < ANY (SELECT Salary + Increment

FROM TEACHER T2, DEPARTMENT D2

WHERE T2.#D = D2.#D AND D.Name = 'CS');

10. Select departments that have fund less that fund at least one faculty:

SELECT Name

FROM DEPARTMENT

WHERE Fund < ANY (SELECT Fund FROM FACULTY);

SELECT Name

FROM DEPARTMENT

WHERE Fund < (SELECT MAX(Fund) FROM FACULTY);

11. Display groups that have rating more that all ratings of groups of 5^th course of CS department

SELECT Num

FROM GROUP

WHERE Rating >ALL (SELECT Rating

FROM GROUP, DEPARTMENT

WHERE GROUP.#D = DEPARTMENT.#D AND

DEPARTMENT.Name = 'CS' AND GROUP.Course = 5);

SELECT Num

FROM GROUP outer

WHERE NOT EXISTS (SELECT Rating

FROM GROUP inner, DEPARTMENT

WHERE GROUP.#D = DEPARTMENT.#D AND

outer.rating <= inner.rating

DEPARTMENT.Name = 'CS' AND GROUP.Course = 5);

Aggregate functions in subqueries

12. Display teaches that have salary+increment more that average salary+increment in the university:

SELECT Tch.Name

FROM DEPARTMENT Dep, TEACHER Tch

WHERE Dep.#D = Tch.#T AND Dep.Name = 'ASU' AND

Tch.Salary + Tch.Increment > (SELECT AVG(Salary+Increment) FROM TEAHER);

13. Dislay faculties that have more than 7 departments:

SELECT Name

FROM FACULTY

WHERE 7 < (SELECT COUNT(*)

FROM DEPARTMENT

WHERE DEPARTMENT.#F = FACULTY.#F);

14. Display teachers that have more than 10 lectures in the 1^st week:

SELECT Name

FROM TEACHER

WHERE 10 < (SELECT COUNT(*)

FROM LECTURE

WHERE LECTURE.#T = TEACHER.#T AND Week = 1);