SQL Questions Below

drop table workon; drop table employee; drop table project; drop table division;

create table division (did integer, dname varchar (25), managerID integer, constraint division_did_pk primary key (did) );

create table employee (empID integer, name varchar(30), salary float, did integer, constraint employee_empid_pk primary key (empid), constraint employee_did_fk foreign key (did) references division(did) );

create table project (pid integer, pname varchar(25), budget float, did integer, constraint project_pid_pk primary key (pid), constraint project_did_fk foreign key (did) references division(did) );

create table workon (pid integer references project(pid), empID integer references employee(empID), hours integer, constraint workon_pk primary key (pid, empID) );

/* loading the data into the database */

insert into division values (1,'engineering', 2); insert into division values (2,'marketing', 1); insert into division values (3,'human resource', 3); insert into division values (4,'Research and development', 5); insert into division values (5,'accounting', 4);

insert into project values (1, 'DB development', 8000, 2); insert into project values (2, 'network development', 6000, 2); insert into project values (3, 'Web development', 5000, 3); insert into project values (4, 'Wireless development', 5000, 1); insert into project values (5, 'security system', 6000, 4); insert into project values (6, 'system development', 7000, 1);

insert into employee values (1,'kevin', 32000,2); insert into employee values (2,'joan', 42000,1); insert into employee values (3,'brian', 37000,3); insert into employee values (4,'larry', 82000,5); insert into employee values (5,'harry', 92000,4); insert into employee values (6,'peter', 45000,2); insert into employee values (7,'peter', 68000,3); insert into employee values (8,'smith', 39000,4); insert into employee values (9,'chen', 71000,1); insert into employee values (10,'kim', 46000,5); insert into employee values (11,'smith', 46000,1);

insert into workon values (3,1,30); insert into workon values (2,3,40); insert into workon values (5,4,30); insert into workon values (6,6,60); insert into workon values (4,3,70); insert into workon values (2,4,45); insert into workon values (5,3,90); insert into workon values (3,3,100); insert into workon values (6,8,30); insert into workon values (4,4,30); insert into workon values (5,8,30); insert into workon values (6,7,30); insert into workon values (6,9,40); insert into workon values (5,9,50); insert into workon values (4,6,45); insert into workon values (2,7,30); insert into workon values (2,8,30); insert into workon values (2,9,30); insert into workon values (1,9,30); insert into workon values (1,8,30); insert into workon values (1,7,30); insert into workon values (1,5,30); insert into workon values (1,6,30); insert into workon values (2,6,30);

Part B SQL queries

Read Study the chapter 2 comparing the difference between join operation and subquery. Formulate the SQL statements for the following queires:

1. Update the budget of a project by 10% if there are more than 2 employees working on it (use group by and having)

2. List the name of employee who work on one project sponsored by his/her own division.

3. List the name of project that has budget that are higher than ALL projects' from chen's division.

4. List the name of employee who work on more projects than employee 'chen'

5. The name of division that has employee who work on other division's project, and list the total number of such employees.