--> RUN THE FOLLOWING COMMANDS IN SQL and answer the questions below:

CREATE TABLE DEMO_STUDENT (SID VARCHAR(5) NOT NULL, NAME VARCHAR(50) NOT NULL, MAJOR VARCHAR(30), YEAR INTEGER, GPA DECIMAL(5,2), CONSTRAINT STU_PK PRIMARY KEY (SID)); CREATE TABLE DEMO_INSTRUCTOR (IID VARCHAR(5) NOT NULL, NAME VARCHAR(50) NOT NULL, DEPT VARCHAR(30), CONSTRAINT INST_PK PRIMARY KEY (IID)); CREATE TABLE DEMO_CLASSROOM (CRID VARCHAR(10) NOT NULL, DESCR VARCHAR(50) NOT NULL, CAP INTEGER, CONSTRAINT CLSR_PK PRIMARY KEY (CRID)); CREATE TABLE DEMO_COURSE (CID VARCHAR(5) NOT NULL, TITLE VARCHAR(50), IID VARCHAR(5) NOT NULL, HOUR INTEGER, CRID VARCHAR(10), CONSTRAINT COURSE_PK PRIMARY KEY (CID), CONSTRAINT COUR_FKDISP1 FOREIGN KEY (IID) REFERENCES DEMO_INSTRUCTOR(IID), CONSTRAINT COUR_FK2 FOREIGN KEY (CRID) REFERENCES DEMO_CLASSROOM(CRID)); CREATE TABLE DEMO_REGISTRATION (RID VARCHAR(5) NOT NULL, SID VARCHAR(5) NOT NULL, CID VARCHAR(5) NOT NULL, CONSTRAINT REG_PK PRIMARY KEY (RID), CONSTRAINT REG_FK1 FOREIGN KEY (SID) REFERENCES DEMO_STUDENT(SID), CONSTRAINT REG_FK2 FOREIGN KEY (CID) REFERENCES DEMO_COURSE(CID));

--> and then insert following data

INSERT INTO DEMO_STUDENT VALUES ('S01', 'Bird', 'Philosophy', 2, 3.5); INSERT INTO DEMO_STUDENT VALUES ('S02', 'Austin', 'English', 2, 3.7); INSERT INTO DEMO_STUDENT VALUES ('S03', 'Scott', 'Statistics', 3, 2.5); INSERT INTO DEMO_STUDENT VALUES ('S04', 'Coleman', 'Business', 1, 1.4); INSERT INTO DEMO_STUDENT VALUES ('S05', 'Jefferson', NULL, 2, 1.8); INSERT INTO DEMO_STUDENT VALUES ('S06', 'Newsome','Business', 1, 2.9); INSERT INTO DEMO_STUDENT VALUES ('S07', 'Hampton','Computer', 2, 2.4); INSERT INTO DEMO_STUDENT VALUES ('S08', 'Hartman','Business', 1, 3.2); INSERT INTO DEMO_STUDENT VALUES ('S09', 'Jones','Computer', 4, 3.9); INSERT INTO DEMO_STUDENT VALUES ('S10', 'Oldham','Business', 1, 3.0); INSERT INTO DEMO_INSTRUCTOR VALUES ('I01', 'Becker', 'BCIS'); INSERT INTO DEMO_INSTRUCTOR VALUES ('I02', 'Lee', 'Computer'); INSERT INTO DEMO_INSTRUCTOR VALUES ('I03', 'Ferguson', 'English'); INSERT INTO DEMO_INSTRUCTOR VALUES ('I04', 'Harvey', 'Statisitics'); INSERT INTO DEMO_INSTRUCTOR VALUES ('I05', 'Koh', 'BCIS'); INSERT INTO DEMO_INSTRUCTOR VALUES ('I06', 'Kent', 'Economics'); INSERT INTO DEMO_CLASSROOM VALUES ('BA 116', 'BA 116', 220); INSERT INTO DEMO_CLASSROOM VALUES ('BA 250', 'BA 250', 40); INSERT INTO DEMO_CLASSROOM VALUES ('BA 356', 'BA 356', 50); INSERT INTO DEMO_CLASSROOM VALUES ('BO 115', 'Biology 115', 70); INSERT INTO DEMO_CLASSROOM VALUES ('CR 204', 'Curry 204', 110); INSERT INTO DEMO_CLASSROOM VALUES ('CR 205', 'Curry 205', 110); INSERT INTO DEMO_CLASSROOM VALUES ('CR 121', 'Computer Science 212', 50); INSERT INTO DEMO_CLASSROOM VALUES ('LA 200', 'Language 200', 65); INSERT INTO DEMO_CLASSROOM VALUES ('MU 245', 'Music 245', 50); INSERT INTO DEMO_CLASSROOM VALUES ('PH 110', 'Physics 110', 250); INSERT INTO DEMO_COURSE VALUES ('C01', 'Introduction to Business', 'I01', 3, 'BA 116'); INSERT INTO DEMO_COURSE VALUES ('C02', 'Introduction to Business', 'I06', 3, 'CR 204'); INSERT INTO DEMO_COURSE VALUES ('C03', 'Business Communications', 'I03', 3, 'CR 205'); INSERT INTO DEMO_COURSE VALUES ('C04', 'Business Ethics', 'I01', 2, 'BA 356'); INSERT INTO DEMO_COURSE VALUES ('C05', 'Economic Policies', 'I06', 2, 'BO 115'); INSERT INTO DEMO_COURSE VALUES ('C06', 'Computer Programming', 'I02', 3, 'CR 121'); INSERT INTO DEMO_COURSE VALUES ('C07', 'Statistics', 'I04', 3, 'PH 110'); INSERT INTO DEMO_COURSE VALUES ('C08', 'Database', 'I05', 3, 'BA 356'); INSERT INTO DEMO_COURSE VALUES ('C09', 'Java', 'I02', 3, 'BA 250'); INSERT INTO DEMO_REGISTRATION VALUES ('R01', 'S01', 'C03'); INSERT INTO DEMO_REGISTRATION VALUES ('R02', 'S02', 'C03'); INSERT INTO DEMO_REGISTRATION VALUES ('R03', 'S02', 'C06'); INSERT INTO DEMO_REGISTRATION VALUES ('R04', 'S03', 'C01'); INSERT INTO DEMO_REGISTRATION VALUES ('R05', 'S03', 'C06'); INSERT INTO DEMO_REGISTRATION VALUES ('R06', 'S03', 'C07'); INSERT INTO DEMO_REGISTRATION VALUES ('R07', 'S04', 'C01'); INSERT INTO DEMO_REGISTRATION VALUES ('R08', 'S04', 'C03'); INSERT INTO DEMO_REGISTRATION VALUES ('R09', 'S04', 'C07'); INSERT INTO DEMO_REGISTRATION VALUES ('R10', 'S05', 'C06'); INSERT INTO DEMO_REGISTRATION VALUES ('R11', 'S05', 'C07'); INSERT INTO DEMO_REGISTRATION VALUES ('R12', 'S06', 'C02'); INSERT INTO DEMO_REGISTRATION VALUES ('R13', 'S06', 'C06'); INSERT INTO DEMO_REGISTRATION VALUES ('R14', 'S07', 'C06'); INSERT INTO DEMO_REGISTRATION VALUES ('R15', 'S07', 'C07'); INSERT INTO DEMO_REGISTRATION VALUES ('R16', 'S08', 'C03'); INSERT INTO DEMO_REGISTRATION VALUES ('R17', 'S08', 'C05');

INSERT INTO DEMO_REGISTRATION VALUES ('R18', 'S09', 'C02'); INSERT INTO DEMO_REGISTRATION VALUES ('R19', 'S09', 'C05'); INSERT INTO DEMO_REGISTRATION VALUES ('R20', 'S09', 'C07'); INSERT INTO DEMO_REGISTRATION VALUES ('R21', 'S01', 'C08'); INSERT INTO DEMO_REGISTRATION VALUES ('R22', 'S02', 'C09'); INSERT INTO DEMO_REGISTRATION VALUES ('R23', 'S05', 'C08'); INSERT INTO DEMO_REGISTRATION VALUES ('R24', 'S06', 'C09'); INSERT INTO DEMO_REGISTRATION VALUES ('R25', 'S01', 'C09');

Now answer the questions below:

21) Get Second Highest GPA from the table demo_student without using offset and limit clauses.

22) Retrieve Cid, Title, Hour from the table demo_course whose title contains mm.

23) Retrieve Sid, Name from the table demo_student who has not registered in any course.

24) Retrieve all the columns from the table demo_student for the 1st year students who are having lowest GPA (GPA <2).

25) Retrieve all the columns from the table demo_classroom such as values of CRID and DESCR should be unique only when the classroom capacity are same b/w classes.