Here is the company database --comments can be added DROP TABLE works_on; DROP TABLE dependent; DROP TABLE project; DROP TABLE dept_location; ALTER TABLE department DROP CONSTRAINT fk_mgrssn CASCADE; ALTER TABLE employee DROP CONSTRAINT fk_dno CASCADE; DROP TABLE department; DROP TABLE employee; CREATE TABLE employee (fnameVARCHAR2(12), minitCHAR(1), lnameVARCHAR2(12), ssnCHAR(9) NOT NULL, bdateDATE, addressVARCHAR2(40), sexCHAR(1), salaryNUMBER(7) NOT NULL, superssnCHAR(9) references employee(ssn), /*superssnCHAR(9),*/ /*either way, but need to know superssn is from ssn*/ CONSTRAINT pk_ssn PRIMARY KEY (SSN)); ALTER TABLE employee ADD (dno NUMBER(2) NOT NULL); INSERT INTO employee VALUES (\'Wolons\', \'E\', \'Aimee\', \'888665555\', \'10-NOV-1927\', \'450 Stone, edsion, NJ\', \'F\', 55000, null,1); INSERT INTO employee VALUES (\'Ramirez\', \'\', \'Damian\', \'987654321\', \'20-JUN-1931\', \'291 Berry, albany, NY\', \'M\', 43000, \'888665555\',4); INSERT INTO employee VALUES (\'Hall\', \'\', \'Nathan\', \'333445555\', \'09-DEC-1945\', \'638 bruce, Oneonta, NY\', \'M\', 40000, \'888665555\',5); INSERT INTO employee VALUES (\'Kelly\', \'\', \'David\', \'999778888\', \'19-JUL-1958\', \'3321 central ave, New York, NY\', \'M\', 25000, \'987654321\',4); INSERT INTO employee VALUES (\'Philip\', \'\', \'Dolensek\', \'123456789\', \'09-JAN-1955\', \'731 clinton, Oneonta, NY\', \'M\', 30000, \'333445555\',5); INSERT INTO employee VALUES (\'Reale\', \'\', \'Michael\', \'666884444\', \'15-SEP-1952\', \'975 Fire Oak, Newark, NJ\', \'M\', 38000, \'333445555\',5); INSERT INTO employee VALUES (\'Smith\', \'\', \'Jason\', \'453453453\', \'31-JUL-1962\', \'5631 Rice, Harrison, NJ\', \'F\', 25000, \'333445555\',5); INSERT INTO employee VALUES (\'Warren\', \'V\', \'Samantha\', \'987987987\', \'29-MAR-1959\', \'908 Dallas, albany, NY\', \'F\', 25000, \'987654321\',4); select e.fname, e.lname, s.fname, s.lname from employee e, employee s where e.superssn=s.ssn; CREATE TABLE department (dnameVARCHAR2(20) NOT NULL, dnumberNUMBER(2) NOT NULL, mgrssnCHAR(9) NOT NULL, mgrstartdateDATE, CONSTRAINT pk_dnumber PRIMARY KEY (DNUMBER), CONSTRAINT fk_mgrssn FOREIGN KEY (mgrssn) REFERENCES employee (ssn)); INSERT INTO department VALUES (\'Research\',5 , \'333445555\', \'22-MAY-1978\'); INSERT INTO department VALUES (\'Administration\',4 , \'987654321\', \'01-JAN-1985\'); INSERT INTO department VALUES (\'Computing Service\', 1, \'888665555\', \'19-JUN-1971\'); ALTER TABLE employee ADD (CONSTRAINT fk_dno FOREIGN KEY (dno) REFERENCES department(dnumber)); CREATE TABLE dept_location (dnumberNUMBER(2) , dlocationVARCHAR2(20), CONSTRAINT pk_num_loc PRIMARY key (dnumber, dlocation), CONSTRAINT fk_dnumber FOREIGN KEY (dnumber) REFERENCES department(dnumber)); INSERT INTO dept_location VALUES (1,\'Fitzelle\'); INSERT INTO dept_location VALUES (4,\'Hunt union\'); INSERT INTO dept_location VALUES (5,\'Natza\'); INSERT INTO dept_location VALUES (5,\'Hunt union\'); INSERT INTO dept_location.

1. Here is the company database
--comments can be added
DROP TABLE works_on;
DROP TABLE dependent;
DROP TABLE project;
DROP TABLE dept_location;
ALTER TABLE department DROP CONSTRAINT fk_mgrssn CASCADE;
ALTER TABLE employee DROP CONSTRAINT fk_dno CASCADE;
DROP TABLE department;
DROP TABLE employee;
CREATE TABLE employee
(fnameVARCHAR2(12),
minitCHAR(1),
lnameVARCHAR2(12),
ssnCHAR(9) NOT NULL,
bdateDATE,
addressVARCHAR2(40),
sexCHAR(1),
salaryNUMBER(7) NOT NULL,
superssnCHAR(9) references employee(ssn),
/*superssnCHAR(9),*/
/*either way, but need to know superssn is from ssn*/
CONSTRAINT pk_ssn PRIMARY KEY (SSN));
ALTER TABLE employee ADD (dno NUMBER(2) NOT NULL);

2. INSERT INTO employee VALUES ('Wolons', 'E', 'Aimee', '888665555',
'10-NOV-1927', '450 Stone, edsion, NJ', 'F', 55000, null,1);
INSERT INTO employee VALUES ('Ramirez', '', 'Damian', '987654321',
'20-JUN-1931', '291 Berry, albany, NY', 'M', 43000, '888665555',4);
INSERT INTO employee VALUES ('Hall', '', 'Nathan', '333445555',
'09-DEC-1945', '638 bruce, Oneonta, NY', 'M', 40000, '888665555',5);
INSERT INTO employee VALUES ('Kelly', '', 'David', '999778888',
'19-JUL-1958', '3321 central ave, New York, NY', 'M', 25000, '987654321',4);
INSERT INTO employee VALUES ('Philip', '', 'Dolensek', '123456789',
'09-JAN-1955', '731 clinton, Oneonta, NY', 'M', 30000, '333445555',5);
INSERT INTO employee VALUES ('Reale', '', 'Michael', '666884444',
'15-SEP-1952', '975 Fire Oak, Newark, NJ', 'M', 38000, '333445555',5);
INSERT INTO employee VALUES ('Smith', '', 'Jason', '453453453',
'31-JUL-1962', '5631 Rice, Harrison, NJ', 'F', 25000, '333445555',5);
INSERT INTO employee VALUES ('Warren', 'V', 'Samantha', '987987987',
'29-MAR-1959', '908 Dallas, albany, NY', 'F', 25000, '987654321',4);
select e.fname, e.lname, s.fname, s.lname
from employee e, employee s
where e.superssn=s.ssn;

3. CREATE TABLE department
(dnameVARCHAR2(20) NOT NULL,
dnumberNUMBER(2) NOT NULL,
mgrssnCHAR(9) NOT NULL,
mgrstartdateDATE,
CONSTRAINT pk_dnumber PRIMARY KEY (DNUMBER),
CONSTRAINT fk_mgrssn FOREIGN KEY (mgrssn) REFERENCES employee (ssn));
INSERT INTO department VALUES ('Research',5 , '333445555', '22-MAY-1978');
INSERT INTO department VALUES ('Administration',4 , '987654321', '01-JAN-1985');
INSERT INTO department VALUES ('Computing Service', 1, '888665555', '19-JUN-1971');
ALTER TABLE employee ADD (CONSTRAINT fk_dno FOREIGN KEY (dno)
REFERENCES department(dnumber));
CREATE TABLE dept_location
(dnumberNUMBER(2) ,
dlocationVARCHAR2(20),
CONSTRAINT pk_num_loc PRIMARY key (dnumber, dlocation),
CONSTRAINT fk_dnumber FOREIGN KEY (dnumber) REFERENCES department(dnumber));

4. INSERT INTO dept_location VALUES (1,'Fitzelle');
INSERT INTO dept_location VALUES (4,'Hunt union');
INSERT INTO dept_location VALUES (5,'Natza');
INSERT INTO dept_location VALUES (5,'Hunt union');
INSERT INTO dept_location VALUES (5,'Fitzelle');
CREATE TABLE project
(pnameVARCHAR2(15),
pnumberNUMBER(2) NOT NULL,
plocationVARCHAR2(15) ,
dnumNUMBER(2),
CONSTRAINT pk_pnumber PRIMARY KEY (PNUMBER),
CONSTRAINT fk_dnum FOREIGN KEY (dnum) REFERENCES department(dnumber));
INSERT INTO project VALUES ('ProductX', 1,'library',5);
INSERT INTO project VALUES ('ProductY', 2,'Fitzelle hall',5);
INSERT INTO project VALUES ('ProductZ', 3,'Library',5);
INSERT INTO project VALUES ('Computerization', 10,'IRC',4);
INSERT INTO project VALUES ('Reorganization', 20,'IRC',1);
INSERT INTO project VALUES ('Newbenefits', 30,'Hunt Union',4);
CREATE TABLE dependent
(essnCHAR(9) NOT NULL,
dependent_name VARCHAR(9) NOT NULL,
sexVARCHAR2(1),
bdateDATE,
relationshipVARCHAR(8),
CONSTRAINT pk_essn PRIMARY KEY (essn, dependent_name),

5. CONSTRAINT fk_essn FOREIGN KEY (essn) REFERENCES employee(ssn) ON DELETE
CASCADE);
INSERT INTO dependent VALUES ('333445555','Alice', 'F','05-APR-1976','Daughter');
INSERT INTO dependent VALUES ('333445555','Theodore', 'M','10-OCT-1973','Son');
INSERT INTO dependent VALUES ('333445555','Joy', 'F','03-MAY-1948','Spouse');
INSERT INTO dependent VALUES ('987654321','Abner', 'M','29-FEB-1932','Spouse');
INSERT INTO dependent VALUES ('123456789','John', 'M','01-JAN-1978','Son');
INSERT INTO dependent VALUES ('123456789','Alice', 'M','31-DEC-1978','Daughter');
INSERT INTO dependent VALUES ('123456789','Elizabeth', 'F','05-MAY-
1957','Spouse');
CREATE TABLE works_on
(essnCHAR(9) NOT NULL,
pnoNUMBER(2) NOT NULL,
hoursNUMBER(3,1),
CONSTRAINT pk_essn_pno PRIMARY KEY (essn, pno),
CONSTRAINT fk_pno FOREIGN KEY (pno) REFERENCES project(pnumber));
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);

6. 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);
--comments can be added
DROP TABLE works_on;
DROP TABLE dependent;
DROP TABLE project;
DROP TABLE dept_location;
ALTER TABLE department DROP CONSTRAINT fk_mgrssn CASCADE;
ALTER TABLE employee DROP CONSTRAINT fk_dno CASCADE;
DROP TABLE department;
DROP TABLE employee;
CREATE TABLE employee
(fnameVARCHAR2(12),
minitCHAR(1),
lnameVARCHAR2(12),
ssnCHAR(9) NOT NULL,
bdateDATE,
addressVARCHAR2(40),
sexCHAR(1),
salaryNUMBER(7) NOT NULL,
superssnCHAR(9) references employee(ssn),
/*superssnCHAR(9),*/
/*either way, but need to know superssn is from ssn*/
CONSTRAINT pk_ssn PRIMARY KEY (SSN));

7. ALTER TABLE employee ADD (dno NUMBER(2) NOT NULL);
INSERT INTO employee VALUES ('Wolons', 'E', 'Aimee', '888665555',
'10-NOV-1927', '450 Stone, edsion, NJ', 'F', 55000, null,1);
INSERT INTO employee VALUES ('Ramirez', '', 'Damian', '987654321',
'20-JUN-1931', '291 Berry, albany, NY', 'M', 43000, '888665555',4);
INSERT INTO employee VALUES ('Hall', '', 'Nathan', '333445555',
'09-DEC-1945', '638 bruce, Oneonta, NY', 'M', 40000, '888665555',5);
INSERT INTO employee VALUES ('Kelly', '', 'David', '999778888',
'19-JUL-1958', '3321 central ave, New York, NY', 'M', 25000, '987654321',4);
INSERT INTO employee VALUES ('Philip', '', 'Dolensek', '123456789',
'09-JAN-1955', '731 clinton, Oneonta, NY', 'M', 30000, '333445555',5);
INSERT INTO employee VALUES ('Reale', '', 'Michael', '666884444',
'15-SEP-1952', '975 Fire Oak, Newark, NJ', 'M', 38000, '333445555',5);
INSERT INTO employee VALUES ('Smith', '', 'Jason', '453453453',
'31-JUL-1962', '5631 Rice, Harrison, NJ', 'F', 25000, '333445555',5);
INSERT INTO employee VALUES ('Warren', 'V', 'Samantha', '987987987',
'29-MAR-1959', '908 Dallas, albany, NY', 'F', 25000, '987654321',4);
select e.fname, e.lname, s.fname, s.lname
from employee e, employee s

8. where e.superssn=s.ssn;
CREATE TABLE department
(dnameVARCHAR2(20) NOT NULL,
dnumberNUMBER(2) NOT NULL,
mgrssnCHAR(9) NOT NULL,
mgrstartdateDATE,
CONSTRAINT pk_dnumber PRIMARY KEY (DNUMBER),
CONSTRAINT fk_mgrssn FOREIGN KEY (mgrssn) REFERENCES employee (ssn));
INSERT INTO department VALUES ('Research',5 , '333445555', '22-MAY-1978');
INSERT INTO department VALUES ('Administration',4 , '987654321', '01-JAN-1985');
INSERT INTO department VALUES ('Computing Service', 1, '888665555', '19-JUN-1971');
ALTER TABLE employee ADD (CONSTRAINT fk_dno FOREIGN KEY (dno)
REFERENCES department(dnumber));
CREATE TABLE dept_location
(dnumberNUMBER(2) ,
dlocationVARCHAR2(20),
CONSTRAINT pk_num_loc PRIMARY key (dnumber, dlocation),
CONSTRAINT fk_dnumber FOREIGN KEY (dnumber) REFERENCES department(dnumber));

9. INSERT INTO dept_location VALUES (1,'Fitzelle');
INSERT INTO dept_location VALUES (4,'Hunt union');
INSERT INTO dept_location VALUES (5,'Natza');
INSERT INTO dept_location VALUES (5,'Hunt union');
INSERT INTO dept_location VALUES (5,'Fitzelle');
CREATE TABLE project
(pnameVARCHAR2(15),
pnumberNUMBER(2) NOT NULL,
plocationVARCHAR2(15) ,
dnumNUMBER(2),
CONSTRAINT pk_pnumber PRIMARY KEY (PNUMBER),
CONSTRAINT fk_dnum FOREIGN KEY (dnum) REFERENCES department(dnumber));
INSERT INTO project VALUES ('ProductX', 1,'library',5);
INSERT INTO project VALUES ('ProductY', 2,'Fitzelle hall',5);
INSERT INTO project VALUES ('ProductZ', 3,'Library',5);
INSERT INTO project VALUES ('Computerization', 10,'IRC',4);
INSERT INTO project VALUES ('Reorganization', 20,'IRC',1);
INSERT INTO project VALUES ('Newbenefits', 30,'Hunt Union',4);
CREATE TABLE dependent
(essnCHAR(9) NOT NULL,
dependent_name VARCHAR(9) NOT NULL,
sexVARCHAR2(1),

10. bdateDATE,
relationshipVARCHAR(8),
CONSTRAINT pk_essn PRIMARY KEY (essn, dependent_name),
CONSTRAINT fk_essn FOREIGN KEY (essn) REFERENCES employee(ssn) ON DELETE
CASCADE);
INSERT INTO dependent VALUES ('333445555','Alice', 'F','05-APR-1976','Daughter');
INSERT INTO dependent VALUES ('333445555','Theodore', 'M','10-OCT-1973','Son');
INSERT INTO dependent VALUES ('333445555','Joy', 'F','03-MAY-1948','Spouse');
INSERT INTO dependent VALUES ('987654321','Abner', 'M','29-FEB-1932','Spouse');
INSERT INTO dependent VALUES ('123456789','John', 'M','01-JAN-1978','Son');
INSERT INTO dependent VALUES ('123456789','Alice', 'M','31-DEC-1978','Daughter');
INSERT INTO dependent VALUES ('123456789','Elizabeth', 'F','05-MAY-
1957','Spouse');
CREATE TABLE works_on
(essnCHAR(9) NOT NULL,
pnoNUMBER(2) NOT NULL,
hoursNUMBER(3,1),
CONSTRAINT pk_essn_pno PRIMARY KEY (essn, pno),
CONSTRAINT fk_pno FOREIGN KEY (pno) REFERENCES project(pnumber));
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);

11. 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);
--comments can be added
DROP TABLE works_on;
DROP TABLE dependent;
DROP TABLE project;
DROP TABLE dept_location;
ALTER TABLE department DROP CONSTRAINT fk_mgrssn CASCADE;
ALTER TABLE employee DROP CONSTRAINT fk_dno CASCADE;
DROP TABLE department;
DROP TABLE employee;
CREATE TABLE employee
(fnameVARCHAR2(12),
minitCHAR(1),
lnameVARCHAR2(12),
ssnCHAR(9) NOT NULL,
bdateDATE,
addressVARCHAR2(40),
sexCHAR(1),
salaryNUMBER(7) NOT NULL,
superssnCHAR(9) references employee(ssn),
/*superssnCHAR(9),*/
/*either way, but need to know superssn is from ssn*/
CONSTRAINT pk_ssn PRIMARY KEY (SSN));

12. ALTER TABLE employee ADD (dno NUMBER(2) NOT NULL);
INSERT INTO employee VALUES ('Wolons', 'E', 'Aimee', '888665555',
'10-NOV-1927', '450 Stone, edsion, NJ', 'F', 55000, null,1);
INSERT INTO employee VALUES ('Ramirez', '', 'Damian', '987654321',
'20-JUN-1931', '291 Berry, albany, NY', 'M', 43000, '888665555',4);
INSERT INTO employee VALUES ('Hall', '', 'Nathan', '333445555',
'09-DEC-1945', '638 bruce, Oneonta, NY', 'M', 40000, '888665555',5);
INSERT INTO employee VALUES ('Kelly', '', 'David', '999778888',
'19-JUL-1958', '3321 central ave, New York, NY', 'M', 25000, '987654321',4);
INSERT INTO employee VALUES ('Philip', '', 'Dolensek', '123456789',
'09-JAN-1955', '731 clinton, Oneonta, NY', 'M', 30000, '333445555',5);
INSERT INTO employee VALUES ('Reale', '', 'Michael', '666884444',
'15-SEP-1952', '975 Fire Oak, Newark, NJ', 'M', 38000, '333445555',5);
INSERT INTO employee VALUES ('Smith', '', 'Jason', '453453453',
'31-JUL-1962', '5631 Rice, Harrison, NJ', 'F', 25000, '333445555',5);
INSERT INTO employee VALUES ('Warren', 'V', 'Samantha', '987987987',
'29-MAR-1959', '908 Dallas, albany, NY', 'F', 25000, '987654321',4);
select e.fname, e.lname, s.fname, s.lname
from employee e, employee s

13. where e.superssn=s.ssn;
CREATE TABLE department
(dnameVARCHAR2(20) NOT NULL,
dnumberNUMBER(2) NOT NULL,
mgrssnCHAR(9) NOT NULL,
mgrstartdateDATE,
CONSTRAINT pk_dnumber PRIMARY KEY (DNUMBER),
CONSTRAINT fk_mgrssn FOREIGN KEY (mgrssn) REFERENCES employee (ssn));
INSERT INTO department VALUES ('Research',5 , '333445555', '22-MAY-1978');
INSERT INTO department VALUES ('Administration',4 , '987654321', '01-JAN-1985');
INSERT INTO department VALUES ('Computing Service', 1, '888665555', '19-JUN-1971');
ALTER TABLE employee ADD (CONSTRAINT fk_dno FOREIGN KEY (dno)
REFERENCES department(dnumber));
CREATE TABLE dept_location
(dnumberNUMBER(2) ,
dlocationVARCHAR2(20),
CONSTRAINT pk_num_loc PRIMARY key (dnumber, dlocation),
CONSTRAINT fk_dnumber FOREIGN KEY (dnumber) REFERENCES department(dnumber));

14. INSERT INTO dept_location VALUES (1,'Fitzelle');
INSERT INTO dept_location VALUES (4,'Hunt union');
INSERT INTO dept_location VALUES (5,'Natza');
INSERT INTO dept_location VALUES (5,'Hunt union');
INSERT INTO dept_location VALUES (5,'Fitzelle');
CREATE TABLE project
(pnameVARCHAR2(15),
pnumberNUMBER(2) NOT NULL,
plocationVARCHAR2(15) ,
dnumNUMBER(2),
CONSTRAINT pk_pnumber PRIMARY KEY (PNUMBER),
CONSTRAINT fk_dnum FOREIGN KEY (dnum) REFERENCES department(dnumber));
INSERT INTO project VALUES ('ProductX', 1,'library',5);
INSERT INTO project VALUES ('ProductY', 2,'Fitzelle hall',5);
INSERT INTO project VALUES ('ProductZ', 3,'Library',5);
INSERT INTO project VALUES ('Computerization', 10,'IRC',4);
INSERT INTO project VALUES ('Reorganization', 20,'IRC',1);
INSERT INTO project VALUES ('Newbenefits', 30,'Hunt Union',4);
CREATE TABLE dependent
(essnCHAR(9) NOT NULL,
dependent_name VARCHAR(9) NOT NULL,
sexVARCHAR2(1),

15. bdateDATE,
relationshipVARCHAR(8),
CONSTRAINT pk_essn PRIMARY KEY (essn, dependent_name),
CONSTRAINT fk_essn FOREIGN KEY (essn) REFERENCES employee(ssn) ON DELETE
CASCADE);
INSERT INTO dependent VALUES ('333445555','Alice', 'F','05-APR-1976','Daughter');
INSERT INTO dependent VALUES ('333445555','Theodore', 'M','10-OCT-1973','Son');
INSERT INTO dependent VALUES ('333445555','Joy', 'F','03-MAY-1948','Spouse');
INSERT INTO dependent VALUES ('987654321','Abner', 'M','29-FEB-1932','Spouse');
INSERT INTO dependent VALUES ('123456789','John', 'M','01-JAN-1978','Son');
INSERT INTO dependent VALUES ('123456789','Alice', 'M','31-DEC-1978','Daughter');
INSERT INTO dependent VALUES ('123456789','Elizabeth', 'F','05-MAY-
1957','Spouse');
CREATE TABLE works_on
(essnCHAR(9) NOT NULL,
pnoNUMBER(2) NOT NULL,
hoursNUMBER(3,1),
CONSTRAINT pk_essn_pno PRIMARY KEY (essn, pno),
CONSTRAINT fk_pno FOREIGN KEY (pno) REFERENCES project(pnumber));
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);

16. 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); 2. (30 points) Here are a couple
subquery problems regarding to the tables in the company database. you might be tempted to use
flat queries to answer some of them, you have to use (if they are not as non-flat query problems)
in this question in order to get better understanding to sub queries. (Hints: sample script file and
textbook.) To find out the script, visit homework 3 for the script. b) find out the lowest salary for
each department (flat query) hint: use group by c) Find out the names of those people whose
salary is the lowest salary in each department. (A little bit more challenging, use nested query or
called subquery) d) find out ssns of those people who work on two projects. (nested query) e)
Find out who works on two projects, i. e, to find out names of those people write a select
command to calculate what the salary would be if every body get a 7% raise. (fiat query) g)
Write an update command to give all employees in the I Research department a seven percent
raise in salary. h Retrieve the names of all employees who have two or more dependents
Solution
1. select min(salary) from employee;
2. select min(salary) from employee,department where mgrssn =ssn group by dnumber;
3.select min(salary),fname from employee,department where mgrssn = ssn group by dnumber
,fname;
4 .select ssn ,count(pno) from employee e, works_on where essn= ssn group by ssn having
count(pno)>2;
5. select fname ,count(pno) from employee e, works_on where essn= ssn group by ssn,fname
having count(pno)>2;
6. select salary*1.07 from employee;
7 . update employee set salary =salary1.07 where ssn in ( select mgrssn from department where
dname ='Research');

17. 8. select fname from employee ,dependent where ssn=essn group by ssn having count(1)>2