1. 1. Alerts
DECLARE
return_value number;
BEGIN
­­ Select the Alert and put message texts into it (can be concatenated with variables)
­­ ??? means the alert name, @@@ means the text that you want to show in the alert.
SET_ALERT_PROPERTY('???',alert_message_text,'@@@');
­­ To capture the choices that users check into a variable, ??? means alert name
return_value := show_alert('???');
­­ Condition when users press Button 1. ### means condition if true, $$$ means condition if
false
IF return_value = alert_button1 THEN
###
­­Condition when users press other buttons
ELSE $$$
END IF;
END;
­­­
2. Call LOV
­­ *** means the LOV name
DECLARE
LOVReturnValue BOOLEAN;
BEGIN
LOVReturnValue := show_LOV('***');
END;

2. Illustration 1: Show Top 5 high­paid staff
SELECT * FROM (
SELECT staff_no, last_name,first_name, salary, ROWNUM rn
FROM (SELECT staff_no,last_name, first_name, salary FROM staff ORDER BY salary DESC))
WHERE RN<=5;
OR
SELECT staff_no, last_name, first_name, salary, ROWNUM rn
FROM (SELECT staff_no, last_name, first_name, salary FROM
staff ORDER BY salary DESC)
WHERE ROWNUM<=5
­­­
Illustration 2: Show and count the number of staff by Birthday Month
SELECT staff_no, Last_name,first_name, to_char(dob,'DD­MM­YYYY'), to_char(dob,'MM')
FROM staff
ORDER BY to_char(dob,'MM')
­­­
Illustration 3: Display the staff who are younger than the date specified
SELECT staff_no, last_name,first_name, to_char(dob,'DD­MM­YYYY')
FROM staff
WHERE dob > To_Date(:DATE_TO_QUERY,'DD­MM­YYYY')