Subtract two query results in mySQL - php

Question

I have 2 queries which gives all records(including the booked ones) and gives out booked records only. I wanted to subtract the two tables so that it only shows the unbooked records, here are the example of the query results:
Query 1:
+--------+--------+
| Number | AreaNo |
+--------+--------+
| 6 | A |
| 6 | B |
| 6 | C |
| 7 | A |
| 7 | B |
+--------+--------+
Query 2:
+--------+--------+
| Number | AreaNo |
+--------+--------+
| 6 | B |
| 6 | C |
| 7 | B |
+--------+--------+
Desired Results:
+--------+--------+
| Number | AreaNo |
+--------+--------+
| 6 | A |
| 7 | A |
| 7 | C |
+--------+--------+
I know that I can't use MINUS in mySQL but I'm not sure that LEFT JOIN works in this situation. If this doesn't work, is it possible to work on the where clause?(Like if the number match, it only clear out the one with matching AreaNo). I tried this with two AND clause and it doesn't work. It clears out the results that doesnt fit either criteria. I have been doing researches over a week and nothing works. Please help, I am really desperated.
Query 1:
SELECT bookingListNo,
areaNo
FROM BookingList,
BookingArea,
BookingLocation
WHERE bookingListNo NOT IN (SELECT bookingListNo
FROM Booking
WHERE bookingAreaNo IS NULL) AND
BookingList.bookingLocationNo = BookingLocation.bookingLocationNo AND
BookingLocation.BookingLocationNo = BookingArea.bookingLocationNo
Query 2:
SELECT bookingListNo,
areaNo
FROM Booking,
BookingArea
WHERE Booking.bookingAreaNo = BookingArea.bookingAreaNo

Answer 1

This is how you do it.
SELECT Q1.Number,
Q1.AreaNo
FROM Query1 Q1
LEFT JOIN Query2 Q2
ON Q1.Number = Q2.Number AND
Q1.AreaNo = Q2.AreaNo
WHERE Q2.Number IS NULL AND
Q2.AreaNo IS NULL

Answer 2

LEFT OUTER JOIN will do the trick
SELECT *
FROM TABLE1 t_1 LEFT OUTER JOIN TABLE2 t_2
ON t_1.AreaNo = t_2.AreaNo ;

Answer 3

Check out this article for reference: http://www.sitepoint.com/understanding-sql-joins-mysql-database/
I'm guessing a RIGHT JOIN would do the trick.
Not exactly sure what your tables are like, but if you are joining a table with unbooked data to one that has all of our items, then you could do a query like this:
SELECT *
FROM all_items
RIGHT JOIN unbooked_data ON all_items.item_id = unbooked_data.item_id
When you RIGHT JOIN it only selects the items that are in the table you are joining on that have matches in the table being joined to. This should allow you to select unbooked data. If this doesn't fit your situation, including your queries in your question might help us answer your problem more directly.

Answer 4

mysql> SELECT tabl1.number,tabl1.areano FROM tabl1 LEFT JOIN tabl2 using(number,
areano) WHERE tabl2.number IS NULL; ;
+--------+--------+
| number | areano |
+--------+--------+
| 6 | A |
| 7 | A |
+--------+--------+