SQL Query using multiple JOIN statements

Question

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I have the following tables:

tblEvents (ID, eventTitle, eventDate, venue)
tblVenues (ID, venueName)
tblDJs (ID, Name)
tblEventDJs (djID, eventID)
tblVenueDJs (djID, venueID, datePlaying)

These tables have the following relationships:

<br />
tblEvents.venue = tblVenues.ID<br />
tblEventDJs.djID = tblDJs.ID<br />
tblEventDJs.eventID = tblEvents.ID<br />
tblVenueDJs.djID = tblDJs.ID<br />
tblVenueDJs.eventID = tblEvents.ID

Now, I need to retrieve where and when a dj will be playing. For example:

Column Name              Sample #1        Sample #2
tblDJs.ID                1                1
tblDJs.name              DJ A             DJ A	
tblEvents.ID             1                <empty>
tblEvents.title          Party A          <empty>
tblEvents.eventDate      12/5/2012        <empty>
tblVenues.ID             1                2
tblVenues.name           Club A           Club B
tblVenueDJs.datePlaying  <empty>          13/5/2012

I have tried the following sql query but so far to no avail. Keep in mind that I'm making use of Microsoft's Acesss. I was thinking that maybe I should be using a LEFT JOIN instead of INNER JOIN. Any help is more then welcome.

SQL

SELECT 	tblDJs.ID, 
	tblDJs.name, 
	tblEvents.ID, 
	tblEvents.title, 
	tblEvents.eventDate, 
	tblVenues.ID, 
	tblVenues.name, 
	tblVenueDJs.datePlaying

FROM 	tblEvents 
	INNER JOIN ((tblVenues 
            INNER JOIN tblVenueDJs 
                ON tblVenues.ID = tblVenueDJs.venueID) 
            INNER JOIN (tblDJs 
                INNER JOIN tblEventDJs 
                    ON tblDJs.ID = tblEventDJs.djID) 
        	ON tblVenueDJs.djID = tblDJs.ID) 
        ON (tblEvents.venue = tblVenues.ID) 
	AND (tblEvents.ID = tblEventDJs.eventID)

Posted 30-May-12 11:38am

Ryan Zahra

Updated 30-May-12 11:46am

Maciej Los

v2

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2 solutions

Solution 1

yes, by the example results you want you should use inner, left and right joins something like this

SQL

SELECT 	tblDJs.ID, 
	tblDJs.name, 
	tblEvents.ID, 
	tblEvents.title, 
	tblEvents.eventDate, 
	tblVenues.ID, 
	tblVenues.name, 
	tblVenueDJs.datePlaying
 
FROM 	tblEvents 
	INNER JOIN ((tblVenues 
            LEFT OUTER JOIN tblVenueDJs 
                ON tblVenues.ID = tblVenueDJs.venueID) 
            INNER JOIN (tblDJs 
                LEFT OUTER JOIN tblEventDJs 
                    ON tblDJs.ID = tblEventDJs.djID) 
        	ON tblVenueDJs.djID = tblDJs.ID) 
        ON (tblEvents.venue = tblVenues.ID) 
	AND (tblEvents.ID = tblEventDJs.eventID)

Posted 30-May-12 12:19pm

reyesfredyreyesfredy

Comments

Ryan Zahra 31-May-12 1:02am

When I tried this, I got the following error:
JOIN expression not supported.

Remember that I am using Microsoft Access

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Maciej Los · Accepted Answer · 2012-05-30T12:25:00

Solution 2

If i understand the relations in database correctly ... the following query fetch all DJ's and them events.

SQL

SELECT tblDJs.ID, tblDJs.name, tblEvents.ID, tblEvents.title, tblEvents.eventDate, tblVenues.ID, tblVenues.name, tblVenueDJs.datePlaying
FROM tblDJs LEFT JOIN tblEventDJs ON tblDJs.ID = tblEventDJs.djID
        LEFT JOIN tblVenueDJs ON tblDJs.ID = tblVenueDJs.djID
        LEFT JOIN tblEvents ON tblEvents.ID = tblEventDJs.eventID 
        LEFT JOIN tblEvents ON tblEvents.ID = tblVenueDJs.eventID 
        LEFT JOIN tblVenues ON tblVenues.ID = tblEvents.venue

Posted 30-May-12 12:25pm

Maciej Los

Comments

Ryan Zahra 31-May-12 1:01am

When I tried this, I got the following error:
Syntax error (missing operator) in query expression 'tblDJs.ID = tblEventDJs.djID
LEFT JOIN tblVenueDJs ON tblDJs.ID = tblVenueDJs.djID
LEFT JOIN tblEvents ON tblEvents.ID = tblEventDJs.eventID
LEFT JOIN tblEvents ON tblEvents.ID = tblVenueDJs.eventID
LEFT JOIN tblVenue'.

Sandeep Mewara 31-May-12 1:34am

5!

Maciej Los 31-May-12 1:44am

Thank you, Sandeep ;)