PL/SQL 嵌套 IF 语句

Question

I had so may errors after I ran the code. The question ask to display the discount given for people who have balance > 100 and if that person has the insurance named BCBS, he/she will get 10% discount. If he/she has insurance named SIH, he/she will get 20% discount. And for people who has balance > 100 but not taking any of the two insurance mentioned before, he/she will get 5% discount. For those who have balance < 100, they need to pay the balance as it is. And the question also asked the patient to write his/her patient id.

accept ptid prompt 'Enter your patieint ID:'
begin
declare
pt_id number;
balance number;
pt_ins varchar2 (11);
amount number;

pt_id := &ptid;
select balance,pt_ins from billing;

if 
balance < 100;
begin
dbms_output.put_line('You need to pay RM '||balance);
end;

else
begin 

if pt_ins = 'BCBS'
begin 
amount := 0.9 * balance;
dbms_output.put_line('You need to pay RM '||amount);
end;

elsif pt_ins := 'SIH'
begin
amount := 0.8 * balance;
dbms_output.put_line('You need to pay RM '||amount);
end;

else
begin
amount := 0.95 * balance;
dbms_output.put_line('You need to pay RM '||amount);
end;

end;

end;

Answer 1

You have to use 'then': if (balance<100) then dbms_output... There should not be a semicolon after the condition You used to need parentheses around the condition.