1) The document describes a PL/SQL code block that will accept a user's account number, check if their balance is less than the minimum balance, and deduct $100 from the balance if so. 2) The code block consists of a declaration section, execution section, and optional exception handling section. 3) A sample PL/SQL code is provided that accepts an account number from the user, checks the balance, and updates the balance by deducting $100 if the balance is less than the minimum.

1. Advanced DBMS– Practical Exercise 6
Sikkim Manipal University Page No.: 12
Exercise 6 PL/SQL
Write a PL/SQL code block that will accept an account number from
the user, check if the users balance is less than minimum balance,
only then deduct Rs.100/- from the balance. This process is fired on
certain table.
Objective: The objective of this program is to enable you to use the Pl/SQL
block.
Procedure and Description:
PL/SQL is a combination of SQL along with the procedural features of
programming languages. A PL/SQL code can be stored in the client system
(client-side) or in the database (server-side). PL/SQL is a block-structured
language. That is, the basic units (procedures, functions, and anonymous
blocks) that make up a PL/SQL program are logical blocks, which can
contain any number of nested sub-blocks.
Each PL/SQL program consists of SQL and PL/SQL statements that form a
PL/SQL block.
A PL/SQL Block consists of three sections:
 The Declaration section (optional).
 The Execution section (mandatory).
 The Exception (or Error) Handling section (optional).
Sample Code:
declare
mano number(5);
mcb number (6,2);
minibal constant number(7,2):=1000.00;
fine number(6,2):=100.00;
begin
mano:=&mano;
select cur_bal into mcb from acct where acctno=mano;

2. Advanced DBMS– Practical Exercise 6
Sikkim Manipal University Page No.: 13
if mcb<minibal then
update acct set cur_bal=cur_bal-fine where acctno=mano;
end if;
end;
Algorithm: The steps for this exercise are given below:
Step – 1: create the table (say table_name with attributes names, current
balance, account number)
Step – 2: Insert the suitable attributes into the table.
Step – 3: write the pl/sql code that satisfy the stated condition. (shown
above)
Step – 4: Execute.
Expected Output:
Creation of table with the help of pl/sql code block.