MySQL: Grouping results with JOIN

If there is no match for 179736 then the contactID should be null, as it is for "Raising the Roof"

So how do you explain these result?
Apple Hill Stories | 86019 | 0
Silly Sally | 86019 | 0

There's something missing in your explanation or maybe we're misunderstanding the concept.

Thank you for asking for clarification.  I want a list of Names for all available books, and I want to know if customer 179736  has already purchased that book or not.

This example should better demonstrate my need.

I have attached a sample dump.

SELECT `ZBooks`.`Name`,
 CASE
    WHEN `ZOrders`.`ContactID` = 179736  THEN 'Customer 179736 Purchased This Book'
    else '-'
    END AS `Status`
from `ZBooks` 
Left Join `ZOrders` on `ZOrders`.`CourseID` = `ZBooks`.`CourseID`
ORDER BY `ZBooks`.`Name` ASC

Select allOpen in new window

The problem with this query is that one of the books is included three times in the list but it should only be included once.  

I want results like this:

10 Smiles		|	Customer 179736 Purchased This Book
Apple Hill Stories	|	-
Finding Phil		|	Customer 179736 Purchased This Book
Hand and Foot	|	Customer 179736 Purchased This Book
Raising the Roof	|	-
Silly Sally		|	-

Select allOpen in new window

zTable.sql

I was working on a solution during your post so maybe what I'm suggesting is not exactly what you need but it's really near to your goal.

This is my query to get the result needed in first sight:

SELECT z1.* FROM (
SELECT ZBooks.Name, ZOrders.ContactID, ContactID =179736 AS X
FROM ZBooks
LEFT JOIN ZOrders ON ZBooks.CourseID = ZOrders.CourseID
ORDER BY ZBooks.Name ASC
) Z1
LEFT JOIN (
SELECT ZBooks.Name, ZOrders.ContactID, ContactID =179736 AS X
FROM ZBooks
LEFT JOIN ZOrders ON ZBooks.CourseID = ZOrders.CourseID
ORDER BY ZBooks.Name ASC) Z2 ON ( Z1.Name = Z2.Name AND Z1.X < Z2.X ) 
WHERE Z2.x IS NULL 
ORDER BY name

Select allOpen in new window

Thank you, Ferruccio Accalai.  That produces the result set that I am looking for.  It uses 3 SELECT statements and 3 JOIN statements.   Is that the most performance efficient way to get these results?