Please help with these sql queries

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);

List the total number of project 'chen' works on (must use subquery)

List the total number of project and total budget for each division, including division name (use outer join)

List the name of the employee who work on one or more projects with budget over $5000.

List the total number of employee whose salary is over company's average salary (subquery)

List the name of manager (note a manager is an employee whose empid is in division table as managerID) who work on project (use subquery)

List the name of employee who don't workon on project 1 (PID =1). (note if you use join, you will generate a wrong result. Use subquery may create correct result. Check out the difference).