Query #2: List the name of the project and total number of hours worked on by all

the employees on this project, also report the number of employees working on each project.

Database:

//STEP #1: CREATE TABLE employee ( fname varchar(15) not null, minit varchar(1), lname varchar(15) not null, ssn char(9), bdate date, address varchar(50), sex char, salary decimal(10,2), Super_ssn char(9), dno char(4), primary key (ssn)); CREATE TABLE department ( dname varchar(25) not null, dnumber char(4), Mgr_ssn char(9) not null, Mgr_start_date date, primary key (dnumber)); CREATE TABLE dept_locations ( dnumber char(4), dlocation varchar(15), primary key (dnumber,dlocation)); CREATE TABLE project ( pname varchar(25) not null, pnumber char(4), plocation varchar(15), dnum char(4) not null, primary key (pnumber), unique (pname)); CREATE TABLE works_on ( essn char(9), pno char(4), hours decimal(4,1), primary key (essn,pno)); CREATE TABLE dependent ( essn char(9), dependent_name varchar(15), sex char, bdate date, relationship varchar(8), primary key (essn,dependent_name)); //STEP #2 INSERT INTO employee VALUES ('John','B','Smith','123456789',TO_DATE('09-JAN-1965','DD-MON-YYYY'),'731 Fondren, Houston, TX','M',30000,333445555,5); INSERT INTO employee VALUES ('Franklin','T','Wong','333445555',TO_DATE('08-DEC-1955','DD-MON-YYYY'),'638 Voss, Houston, TX','M',40000,'888665555',5); INSERT INTO employee VALUES ('Alicia','J','Zelaya','999887777',TO_DATE('19-JUL-1968','DD-MON-YYYY'),'3321 Castle, Spring, TX','F',25000,'987654321',4); INSERT INTO employee VALUES ('Jennifer','S','Wallace','987654321',TO_DATE('20-JUN-1941','DD-MON-YYYY'),'291 Berry, Bellaire, TX','F',43000,'888665555',4); INSERT INTO employee VALUES ('Ramesh','K','Narayan','666884444',TO_DATE('15-SEP-1962','DD-MON-YYYY'),'975 Fire Oak, Humble, TX','M',38000,'333445555',5); INSERT INTO employee VALUES ('Joyce','A','English','453453453',TO_DATE('31-JUL-1972','DD-MON-YYYY'),'5631 Rice, Houston, TX','F',25000,'333445555',5); INSERT INTO employee VALUES ('Ahmad','V','Jabbar','987987987',TO_DATE('29-MAR-1969','DD-MON-YYYY'),'980 Dallas, Houston, TX','M',25000,'987654321',4); INSERT INTO employee VALUES ('James','E','Borg','888665555',TO_DATE('10-NOV-1937','DD-MON-YYYY'),'450 Stone, Houston, TX','M',55000,null,1); INSERT INTO department VALUES ('Research', 5, '333445555', TO_DATE('22-MAY-1988','DD-MON-YYYY')); INSERT INTO department VALUES ('Administration', 4, '987654321', TO_DATE('01-JAN-1995','DD-MON-YYYY')); INSERT INTO department VALUES ('Headquarters', 1, '888665555', TO_DATE('19-JUN-1981','DD-MON-YYYY')); INSERT INTO project VALUES ('ProductX',1,'Bellaire',5); INSERT INTO project VALUES ('ProductY',2,'Sugarland',5); INSERT INTO project VALUES ('ProductZ',3,'Houston',5); INSERT INTO project VALUES ('Computerization',10,'Stafford',4); INSERT INTO project VALUES ('Reorganization',20,'Houston',1); INSERT INTO project VALUES ('Newbenefits',30,'Stafford',4); INSERT INTO dept_locations VALUES (1,'Houston'); INSERT INTO dept_locations VALUES (4,'Stafford'); INSERT INTO dept_locations VALUES (5,'Bellaire'); INSERT INTO dept_locations VALUES (5,'Sugarland'); INSERT INTO dept_locations VALUES (5,'Houston'); INSERT INTO dependent VALUES ('333445555','Alice','F',TO_DATE('05-APR-86','DD-MON-YY'),'Daughter'); INSERT INTO dependent VALUES ('333445555','Theodore','M',TO_DATE('25-OCT-83','DD-MON-YY'),'Son'); INSERT INTO dependent VALUES ('333445555','Joy','F',TO_DATE('03-MAY-58','DD-MON-YY'),'Spouse'); INSERT INTO dependent VALUES ('987654321','Abner','M',TO_DATE('28-FEB-42','DD-MON-YY'),'Spouse'); INSERT INTO dependent VALUES ('123456789','Michael','M',TO_DATE('01-JAN-78','DD-MON-YY'),'Son'); INSERT INTO dependent VALUES ('123456789','Alice','F', TO_DATE('31-DEC-88','DD-MON-YY'),'Daughter'); INSERT INTO dependent VALUES ('123456789','Elizabeth','F',TO_DATE('05-MAY-67','DD-MON-YY'),'Spouse'); INSERT INTO works_on VALUES ('123456789',1, 32.5); INSERT INTO works_on VALUES ('123456789',2, 7.5); INSERT INTO works_on VALUES ('666884444',3, 40.0); INSERT INTO works_on VALUES ('453453453',1, 20.0); INSERT INTO works_on VALUES ('453453453',2, 20.0); INSERT INTO works_on VALUES ('333445555',2, 10.0); INSERT INTO works_on VALUES ('333445555',3, 10.0); INSERT INTO works_on VALUES ('333445555',10,10.0); INSERT INTO works_on VALUES ('333445555',20,10.0); INSERT INTO works_on VALUES ('999887777',30,30.0); INSERT INTO works_on VALUES ('999887777',10,10.0); INSERT INTO works_on VALUES ('987987987',10,35.0); INSERT INTO works_on VALUES ('987987987',30, 5.0); INSERT INTO works_on VALUES ('987654321',30,20.0); INSERT INTO works_on VALUES ('987654321',20,15.0); INSERT INTO works_on VALUES ('888665555',20,null); //STEP#3 ALTER TABLE EMPLOYEE ADD CONSTRAINT employee_superssn_fk FOREIGN KEY (Super_ssn) REFERENCES employee (ssn); ALTER TABLE EMPLOYEE ADD CONSTRAINT employee_dno_fk FOREIGN KEY (Dno) REFERENCES department (dnumber); ALTER TABLE department ADD CONSTRAINT department_mgrssn_fk FOREIGN KEY (Mgr_ssn) REFERENCES employee (ssn); ALTER TABLE dept_locations ADD CONSTRAINT deptlocations_dnumber_fk foreign key (dnumber) references department(dnumber); ALTER TABLE project ADD CONSTRAINT project_dnum_fk foreign key (dnum) references department(dnumber); ALTER TABLE works_on ADD CONSTRAINT workson_essn_fk foreign key (essn) references employee(ssn); ALTER TABLE works_on ADD CONSTRAINT workson_pno_fk foreign key (pno) references project(pnumber); ALTER TABLE dependent ADD CONSTRAINT dependent_essn_fk foreign key (essn) references employee(ssn);