?? decode_求所得稅.txt
字號:
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--最高稅率:<1000, 稅率 0。1000--2000 稅率 0.1。2000--3000 稅率 0.2,3000--4000 0.31
--4000以上0.5
insert into sm_emp values('aa1','aa1',null,'12');
insert into sm_emp values('aa3','aa3',3001,'12');
insert into sm_emp values('aa4','aa4',4001,'12');
insert into sm_emp values('aa5','aa5',5001,'12');
--建立雇員工資單:顯示雇員編號,名稱,工資,所得稅,稅后工資。
--一個view
create or replace view emp_salary as
select empid,name , salary ,
decode( trunc(salary/1000, 0), 0, 0.0,
1, (salary-1000)*0.1,
2, (salary-2000)*0.2 +1000*0.1,
3, (salary-3000)*0.31+1000*0.2+1000*0.1,
(salary-4000)*0.5+1000*0.31+1000*0.2+1000*0.1) tax ,
salary -decode( trunc(salary/1000, 0), 0, 0.0,
1, (salary-1000)*0.1,
2, (salary-2000)*0.2 +1000*0.1,
3, (salary-3000)*0.31+1000*0.2+1000*0.1,
(salary-4000)*0.5+1000*0.31+1000*0.2+1000*0.1) shijisal
from sm_emp;
--兩個view
create or replace view emp_sal1 as
select empid,name , salary ,
decode( trunc(salary/1000, 0), 0, 0.0,
1, (salary-1000)*0.1,
2, (salary-2000)*0.2 +1000*0.1,
3, (salary-3000)*0.31+1000*0.2+1000*0.1,
(salary-4000)*0.5+1000*0.31+1000*0.2+1000*0.1) tax
from sm_emp;
create or replace view emp_salary2 as
select empid,name,salary , tax,salary-tax shijisal from emp_sal1;
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