PL/SQL update rate using having count

Question

Hi am newbie at pl/sql
I need to update rate_per_hour for all projects having less than 5 employee to 500
here is the code what i wrote, but it updates all employee
set serveroutput on
declare
  cursor rate_cur is
  select * from project
  for update of rate_per_hour;
begin
  for rate_rec IN rate_cur
  loop
    update project
    set rate_per_hour=500
    where current of rate_cur;
  end loop;
end;Here is my tables:
CREATE TABLE employee(
empid number(5),
empname varchar(20),
address varchar(20),
no_of_dependents number(5),
deptno number(5),
CONSTRAINT EMPLOYEE_PKEY PRIMARY KEY(empid),
CONSTRAINT EMPLOYEE_FKEY FOREIGN KEY(deptno) REFERENCES department(deptno));
CREATE TABLE project(
projectno number(5),
location varchar(20),
incharge number(5),
rate_per_hour number(5),
CONSTRAINT PROJECT_PKEY PRIMARY KEY(projectno),
CONSTRAINT PROJECT_FKEY FOREIGN KEY(incharge) REFERENCES employee(empid));
CREATE TABLE assignment(
empid number(5),
projectid number(5),
hours number(5),
CONSTRAINT ASSIGNMENT_FKEY FOREIGN KEY(empid) REFERENCES employee(empid),
CONSTRAINT ASSIGNEMNT_FKEY2 FOREIGN KEY(projectid) REFERENCES project(projectno));please suggest a solution
Edited by: user12970368 on Dec 15, 2011 6:55 AM

Answer 1

here is test data
/*department table */
insert into department values(201,'ADMINISTRATION',10000,101);
insert into department values(202,'FINANCE',10000,102);
insert into department values(203,'ACCOUTING',10000,103);
insert into department values(204,'HR',10000,104);
insert into department values(205,'TESTING',10000,105);
/*employee table
insert into employee values(101,'Marlen', 'DXB1',5,201);
insert into employee values(102,'Oleg', 'DXB2',2,201);
insert into employee values(103,'Adil', 'SHJ1',1,202);
insert into employee values(104,'Sultan', 'AD1',0,202);
insert into employee values(105,'John', 'AD2',1,203);
insert into project values(001,'Dubai Marina',101,50);
insert into project values(002,'Bur Dubai',101,40);
insert into project values(003,'Palm Jumeirah',103,60);
insert into project values(004,'Media city',101,100);
insert into project values(005,'TECOM',101,30);
/*assignment table */
insert into assignment values(101,001,55);
insert into assignment values(101,004,128);
insert into assignment values(101,005,77);
insert into assignment values(102,002,27);
insert into assignment values(103,003,250);Edited by: user12970368 on Dec 15, 2011 6:54 AM