what is procedure sql code example

Example 1: procedure in sql

-Stored procedure is a group of SQL
statements that has been created 
and stored in the database.
-A stored procedure will accept input 
parameters so that a single procedure
can be used over the network by several
clients using different input data.
-A stored procedures will reduce
network traffic and increase the performance. 
If we modify a stored procedure all the
clients will get the updated stored procedure.

Sample of creating a stored procedure
CREATE PROCEDURE test_display AS
SELECT FirstName, LastName FROM tb_test
EXEC test_display

Example 2: sql procedure

CREATE OR REPLACE PROCEDURE my_scheme.my_procedure(param1 IN VARCHAR2) IS
    cnumber NUMBER;
BEGIN
    cnumber := 10;
    INSERT INTO my_table (num_field) VALUES (param1 + cnumber);
    COMMIT;
EXCEPTION
    WHEN OTHERS THEN
        raise_application_error(-20001, 'An error was encountered - '
            || sqlcode || ' -ERROR- ' || sqlerrm);
END;