If-Else in PL/SQL - oracle

Question

I want to write a procedure to perform withdraw operation that only permits a withdrawal, if there is sufficient funds in the account then update the Account table and print the message, 'Transaction successful.' else print, 'Insufficient Amount.' . The procedure should take Account_id and withdrawal amount as input.
Account:
ACCNO NUMBER PK
CUSTOMER_NAME VARCHAR2(30)
BALANCE NUMBER(15,2)
12345 Williams 23455.6
23456 Robert 43221
34521 John 23449
Functional Requirement:
procedure withdraw(ano number , amt number)
Sample input:
withdraw(12345, 2000);
Sample output:
Transaction successful.
I tried to write this code which is as follows-
set serveroutput on;
create or replace procedure withdraw(ano number, amt number) is withdraw_operation account%rowtype;
begin
select * into withdraw_operation from account
if (amt > balance)
then dbms_output.put_line('Transaction successful');
else dbms_output.put_line('Insufficient Amount');
end if;
end;
But this is not showing any output nor error, please help. Thanks in advance!

Answer 1

this is not showing any output nor error
This is hard to believe because what you posted isn't correct.
Anyway: from what you posted, should be something like this:
Sample data:
SQL> SET SERVEROUTPUT ON;
SQL>
SQL> SELECT * FROM account;
ACCNO CUSTOMER BALANCE
---------- -------- ----------
12345 Williams 23455,6
23456 Robert 43221
34521 John 23449
Procedure:
SQL> CREATE OR REPLACE PROCEDURE withdraw (ano NUMBER, amt NUMBER)
2 IS
3 withdraw_operation account%ROWTYPE;
4 BEGIN
5 SELECT *
6 INTO withdraw_operation
7 FROM account
8 WHERE accno = ano;
9
10 IF amt > withdraw_operation.balance
11 THEN
12 DBMS_OUTPUT.put_line ('Transaction successful');
13 ELSE
14 DBMS_OUTPUT.put_line ('Insufficient Amount');
15 END IF;
16 END;
17 /
Procedure created.
Testing:
SQL> EXEC withdraw(12345, 2000);
Insufficient Amount
PL/SQL procedure successfully completed.
SQL>