(A) Watch the lecture video about "Trigger" and do the following tasks:

A1. Explain the ROLE of trigger (30 words)

A2. Create a trigger that when a workon record is added (namely, an employee works on a new project so an new row is INSERTED) the trigger will increase the salary of THIS employee who work on THIS project by 1% if this employees' salary is less than 85000. (for example, when your add a row (1, 100, 20) into workon table (Using INSERT statement), assuming employee 100 exists, your trigger code needs to find out (use Where clause) if the employee's salary is less than 85000, if so, increase his salary.( Hint: use After trigger, and use :new to refer the workon table after the change ) see the examples in "notes of trigger and its samples" posted at Canvas.

show me:

(1).trigger code.

(2) the table contents of employee and workon before triggering event (insert).

(3) table contents after triggering event. This way I can see if the trigger works or not. Also show your INSERT statement (insert a row into workon table to test your trigger).

(B) SQL Queries

1. List name of projects that has more workers from out side ( p.did <> e.did) than its inside workers ( i.e. its workers are from the same division: p.did = e.did) .

2. List the name of division that has more employees whose salary is above than company's average salary than any other divisions.

3. Increase the salary of division manager if he/she works on more than 1 other division's project .

4. List the name of project that has more than one managers working on it.

5, List the name of division that has MOST of employees working on projects.

6. List the name of project that engineering division has more employees working on it than employees of accounting division.

7. List the name of manager of the division that has a project with highest total man-hours (sum(hours))

8 List name of division that has at least 3 employees who work on other division's project.

9. Write one SQL statement that can list all of the following 5 columns for EACH project:

col 1: the name of the project (e.g., 'abc'),

col 2: name of division (e.g., 'xyz') that sponsors the project 'abc'

col 3. total number of employees who work on 'abc'

col 4: total number of employees from division 'xyz' (i.e., insiders) who work on 'abc',

col 5: total number of other division's employees (i.e., outsiders) who work on 'abc'.

DATA

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, empID integer, 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 employee values (12,'joan', 48000,1); insert into employee values (13,'kim', 49000,2); insert into employee values (14,'austin', 46000,1); insert into employee values (15,'sam', 52000,3); 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); insert into workon values (2,12,30); insert into workon values (3,13,30); insert into workon values (4,14,20); insert into workon values (4,15,40);