By adding a table which links evt_details to evt_sponsors, you do away with the need to have (up to 4) distinct fields to hold the evt_sponsor in your evt_details table.
So add something like table : `evt_sponsors_list`
`evt_detail_link_id` INT 6 `evt_sponsor_link_id` INT 6
Then your query becomes more like :
SELECT evt_detail_id, evt_detail_title, evt_sponsor_name FROM evt_details LEFT JOIN evt_sponsors_list ON evt_detail_id=evt_detail_link_id LEFT JOIN evt_sponsors ON evt_sponsor_link_id=evt_sponsor_id WHERE evt_detail_date <= DATE_SUB(NOW(), INTERVAL 1 DAY)
The left join evt_sponsors_list will pull any number (1-many) of results where there is one or more matching sponsor. The left join evt_sponsors will then match those results to the evt_sponsors table, resulting in a series of rows for each event. You could change the 1st join to read 'LEFT OUTER JOIN' if you wanted to get events where there are *no* sponsors (what you were previously doing with `OR e.evt_sponsor_id_n =0`)
This is a one-to-many relationship and allows you to have flexibility for any number of event sponsors (not just 4) without adding more and more fields to your event_detail table. Make sure to index both columns in the evt_detail_link table for good performance, and the storage overhead is almost neglible.
You can then run a simple loop in PHP, cache the new row each time the evt_detail_id changes (containing the event title, the ID is useful so you can link to full details by event_id if you need to). Then for the 1st and subsequent rows, just use the evt_sponsor_name. Output the previous row when the evt_detail_id changes, and output the final row when there are no more results.
Cheers - Neil.
At 22:24 04/05/2004 +0000, you wrote:
PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php From: "Erik Meyer" <emeyer@xxxxxxxxxxxx> To: "PHP-DB" <php-db@xxxxxxxxxxxxx> Date: Tue, 4 May 2004 17:24:59 -0500 Message-ID: <DFEPKAKJMAFKINPMJGNNEEEGCCAA.emeyer@xxxxxxxxxxxx> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Subject: Struggling
Hope someone can help me.
I have two tables:
evt_details evt_sponsors
The structure is as follows:
evt_details evt_sponsors
evt_detail_id (INT)(PK) evt_sponsor_id (INT)(PK)
evt_detail_title (CHAR) evt_sponsor_name (CHAR)
evt_sponsor_id1 (INT) NON-NULL
evt_detail_date (date)
evt_sponsor_id2 (INT) NULL
evt_sponsor_id3 (INT) NULL
evt_sponsor_id4 (INT) NULL
Now, the event can have either 1 sponsor, 2 sponsors, 3 sponsors, or 4 sponsors.
Is there a way where I can return a result whether it has 1, 2, 3, or 4 since some of the events will not have a 2d,3d, or 4th sponsor, a combination of 1 & 2, 1,2,3, or all 4 depending on the values in the table?
Here is the query I have:
SELECT e.evt_detail_title, a.evt_sponsor_name, b.evt_sponsor_name, c.evt_sponsor_name, d.evt_sponsor_name FROM evt_sponsors a, evt_sponsors b, evt_sponsors c, evt_sponsors d, evt_details e WHERE e.evt_detail_date <= DATE_SUB(NOW(), INTERVAL 1 DAY) AND e.evt_sponsor_id1=a.evt_sponsor_id AND (e.evt_sponsor_id2=b.evt_sponsor_id OR e.evt_sponsor_id2=0) AND (e.evt_sponsor_id3 =c.evt_sponsor_id OR e.evt_sponsor_id3=0) AND (e.evt_sponsor_id4=d.evt_sponsor_id OR e.evt_sponsor_id4 =0)
Thanks for the help, Erik W. Meyer
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