2.要求: 打印出 80 部门的所有的员工的工资: Xxx 's salary is: xxx

declare
cursor sal_cursor is select salary ,last_name from employees where department_id = 80;
v_sal number(10);
v_name varchar2(20);
begin
open sal_cursor;

fetch sal_cursor into v_sal,v_name;

while sal_cursor%found loop
dbms_output.put_line(v_name||'`s salary is '||v_sal);
fetch sal_cursor into v_sal,v_name;
end loop;

close sal_cursor;

end;

3.打印出 manager_id 为 100 的员工的 last_name, email, salary 信息(使用游标, 记录类型)

declare
--声明游标
cursor emp_cursor is select last_name, email, salary from employees where manager_id = 100;

--声明记录类型
type emp_record is record(
name employees.last_name%type,
email employees.email%type,
salary employees.salary%type
);

-- 声明记录类型的变量
v_emp_record emp_record;
begin
--打开游标
open emp_cursor;

--提取游标
fetch emp_cursor into v_emp_record;

--对游标进行循环操作
while emp_cursor%found loop
dbms_output.put_line(v_emp_record.name || ', ' || v_emp_record.email || ', ' || v_emp_record.salary );
fetch emp_cursor into v_emp_record;
end loop;

--关闭游标
close emp_cursor;
end;
(法二：使用for循环)
declare
cursor emp_cursor is select last_name,email,salary from employees where manager_id = 100;
begin
for v_emp_record in emp_cursor loop
dbms_output.put_line(v_emp_record.last_name||','||v_emp_record.email||','||v_emp_record.salary);
end loop;
end;

4. 利用游标, 调整公司中员工的工资:

工资范围 调整基数
0 - 5000 5%
5000 - 10000 3%
10000 - 15000 2%
15000 - 1%

declare
--定义游标
cursor emp_sal_cursor is select salary, employee_id from employees;

--定义基数变量
temp number(4, 2);

--定义存放游标值的变量
v_sal employees.salary%type;
v_id employees.employee_id%type;
begin
--打开游标
open emp_sal_cursor;

--提取游标
fetch emp_sal_cursor into v_sal, v_id;

--处理游标的循环操作
while emp_sal_cursor%found loop
--判断员工的工资, 执行 update 操作
--dbms_output.put_line(v_id || ': ' || v_sal);

if v_sal <= 5000 then
temp := 0.05;
elsif v_sal<= 10000 then
temp := 0.03;
elsif v_sal <= 15000 then
temp := 0.02;
else
temp := 0.01;
end if;

--dbms_output.put_line(v_id || ': ' || v_sal || ', ' || temp);
update employees set salary = salary * (1 + temp) where employee_id = v_id;

fetch emp_sal_cursor into v_sal, v_id;
end loop;
--关闭游标
close emp_sal_cursor;
end;

使用SQL中的 decode 函数

update employees set salary = salary * (1 + (decode(trunc(salary/5000), 0, 0.05,
1, 0.03,
2, 0.02,
0.01)))

5. 利用游标 for 循环完成 4.

declare
--定义游标
cursor emp_sal_cursor is select salary, employee_id id from employees;

--定义基数变量
temp number(4, 2);
begin
--处理游标的循环操作
for c in emp_sal_cursor loop
--判断员工的工资, 执行 update 操作
--dbms_output.put_line(v_id || ': ' || v_sal);

if c.salary <= 5000 then
temp := 0.05;
elsif c.salary <= 10000 then
temp := 0.03;
elsif c.salary <= 15000 then
temp := 0.02;
else
temp := 0.01;
end if;

--dbms_output.put_line(v_id || ': ' || v_sal || ', ' || temp);
update employees set salary = salary * (1 + temp) where employee_id = c.id;
end loop;
end;

6*. 带参数的游标

declare
--定义游标
cursor emp_sal_cursor(dept_id number, sal number) is
select salary + 1000 sal, employee_id id
from employees
where department_id = dept_id and salary > sal;

--定义基数变量
temp number(4, 2);
begin
--处理游标的循环操作
for c in emp_sal_cursor(sal => 4000, dept_id => 80) loop
--判断员工的工资, 执行 update 操作
--dbms_output.put_line(c.id || ': ' || c.sal);

if c.sal <= 5000 then
temp := 0.05;
elsif c.sal <= 10000 then
temp := 0.03;
elsif c.sal <= 15000 then
temp := 0.02;
else
temp := 0.01;
end if;

dbms_output.put_line(c.sal || ': ' || c.id || ', ' || temp);
--update employees set salary = salary * (1 + temp) where employee_id = c.id;
end loop;
end;