the thing with JOINs are you gotta JOIN a table ON another table where
something matches something else (in most cases). I tried to clean this up a
bit but im rather new to mysql.
SELECT DISTINCT
(td.td_id),
td.venue_id as ven_id,
td.td_date as td_date,
art.NAME as art_name,
art.WEB as art_url,
artd.artist_id as art_id,
tv.ID,
tv.NAME as ven_name,
tv.ADDR1 ven_add0,
tv.ADDR2 as ven_add1,
tv.CITY as ven_city,
tv.STATE ven_state,
tv.ZIPCODE as ven_zip,
tv.COUNTRY,
tv.WEBSITE as ven_url,
tvc.SIZE as capacity,
tvage.TYPE as age,
tv.TICKETAGNCY1 as tix0,
tv.TICKETAGNCY2 as tix1
FROM tourdates td
INNER JOIN tbl_ARTST as art
ON?
INNER JOIN artist_tourdate artd
ON?
INNER JOIN tbl_VENUES tv
ON?
INNER JOIN tbl_VENUE_CAPACITY tvc
ON?
INNER JOIN tbl_VENUE_AGE_XREF tvax
ON?
INNER JOIN tbl_VENUE_AGES tvage
ON?
LEFT JOIN tbl_VENUE_CAPACITY
ON (tv.ID=tvc.VENUE_ID)
LEFT JOIN tbl_VENUE_AGE_XREF
ON (tv.ID=tvax.VENUE_ID)
LEFT JOIN tbl_VENUE_AGES
ON (tvax.VENUE_ID = tvage.PKEY)
WHERE td_date > NOW() AND (td.td_id = artd.td_id AND artd.artist_id =
art.PKEY AND
td.venue_id=tv.ID) LIMIT 500
iHTH,
On 6/23/06, Peter Brawley <[EMAIL PROTECTED]> wrote:
Paul,
>SELECT ...
>FROM
> tourdates td,
> tbl_ARTST as art,
> artist_tourdate artd ,
> tbl_VENUES tv,
> tbl_VENUE_CAPACITY tvc ,
> tbl_VENUE_AGE_XREF tvax,
> tbl_VENUE_AGES tvage
>LEFT JOIN tbl_VENUE_CAPACITY ON (tv.ID=tvc.VENUE_ID)
>LEFT JOIN tbl_VENUE_AGE_XREF ON (tv.ID=tvax.VENUE_ID)
>LEFT JOIN tbl_VENUE_AGES ON (tvax.VENUE_ID = tvage.PKEY)
>WHERE td_date > NOW()
> AND (td.td_id = artd.td_id
> AND artd.artist_id = art.PKEY
> AND td.venue_id=tv.ID)
> LIMIT 500
FROM ... tbl_VENUE_CAPACITY tvc, ... LEFT JOIN tbl_VENUE_CAPACITY ON ...
cross-joins four previous tables with tbl_venu-capacity, then left
joins seven tables including tbl_VENUE_CAPACITY with tbl_VENUE_CAPACITY!
FROM tbl_VENUE_AGE_XREF tvax, ... LEFT JOIN tbl_VENUE_AGE_XREF ON ...
cross-joins five previous tables with tbl_VENUE_AGE_XREF, then left joins
seven tables including tbl_VENUE_AGE_XREF with tbl_VENUE_AGE_XREF!
FROM tbl_VENUE_AGES tvage ... LEFT JOIN ... tbl_VENUE_AGES ...
cross-joins six previous tables with tbl_VENUE_AGES, then left joins
seven tables including tbl_VENUE_AGES with tbl_VENUE_AGES!
The double joins and cross joins will drive the server crazy. It's
incoherent---the query makes no use of the double/cross/self-joins.
Strong suggestion: lose the comma joins entirely, lose the duplicate
joins, and write the join logic as explicit joins, for example
SELECT ...
FROM tourdates td
INNER JOIN artist_tourdate AS artd USING (td_id)
INNER JOIN tbl_artst AS art ON artd.artist_id = art.pkey
INNER JOIN tbl_venues AS tv ON td.venue_id=tv.ID
LEFT JOIN tbl_venue_capacity AS tvc ON tv.ID=tvc.venue_id
LEFT JOIN tbl_venue_age_xref AS tvax ON tv.ID=tvax.Venue_id
LEFT JOIN tbl_venue_ages AS tvage ON tvax.VENUE_ID = tvage.pkey
WHERE td_date > NOW()
LIMIT 500
PB
-----
Paul Nowosielski wrote:
> Dear All,
>
> I've been hashing out this query for awhile with no luck as of yet.
> Basically the query works if I put a limit of 500 or so but when I do
the full
> query it takes up so many resource that the database engine is useless.
>
> Here is the query:
>
> SELECT DISTINCT (td.td_id) ,td.venue_id as ven_id, td.td_date as
td_date,
> art.NAME as art_name,art.WEB as art_url, artd.artist_id as art_id, tv.ID
,
> tv.NAME as ven_name, tv.ADDR1 ven_add0, tv.ADDR2 as ven_add1,tv.CITY
> ven_city,tv.STATE ven_state, tv.ZIPCODE ven_zip,tv.COUNTRY ,tv.WEBSITEas
> ven_url,tvc.SIZE as capacity,
> tvage.TYPE as age,tv.TICKETAGNCY1 as tix0, tv.TICKETAGNCY2 as tix1
>
> FROM tourdates td, tbl_ARTST as art, artist_tourdate artd , tbl_VENUES
tv,
> tbl_VENUE_CAPACITY tvc
> ,tbl_VENUE_AGE_XREF tvax, tbl_VENUE_AGES tvage
>
> LEFT JOIN tbl_VENUE_CAPACITY ON (tv.ID=tvc.VENUE_ID)
>
> LEFT JOIN tbl_VENUE_AGE_XREF ON (tv.ID=tvax.VENUE_ID)
>
> LEFT JOIN tbl_VENUE_AGES ON (tvax.VENUE_ID = tvage.PKEY)
>
>
> WHERE
>
> td_date > NOW() AND (td.td_id = artd.td_id AND artd.artist_id = art.PKEYAND
> td.venue_id=tv.ID) LIMIT 500
>
> Here is a description of the query:
>
+--------------------+--------+-----------------------+---------+---------+----------------+-------+------------------------------+
> | table | type | possible_keys | key |
key_len |
> ref | rows | Extra |
>
+--------------------+--------+-----------------------+---------+---------+----------------+-------+------------------------------+
> | td | range | PRIMARY,idx01,dateidx | dateidx |
4 |
> NULL | 43943 | Using where; Using temporary |
> | artd | ref | idx01,idx02 | idx01 |
4 |
> td.td_id | 1 | |
> | art | eq_ref | PRIMARY,idx02 | PRIMARY |
4 |
> artd.artist_id | 1 | Using where |
> | tv | eq_ref | PRIMARY,idx04 | PRIMARY |
4 |
> td.venue_id | 1 | Using where |
> | tvage | ALL | NULL |
NULL | NULL |
> NULL | 4 | |
> | tvc | ALL | NULL |
NULL | NULL |
> NULL | 10261 | |
> | tbl_VENUE_CAPACITY | index | NULL | idx01 |
5 |
> NULL | 10261 | Using index; Distinct |
> | tvax | index | NULL | idx01 |
8 |
> NULL | 11616 | Using index; Distinct |
> | tbl_VENUE_AGE_XREF | index | NULL | idx01 |
8 |
> NULL | 11616 | Using index; Distinct |
> | tbl_VENUE_AGES | index | NULL | PRIMARY |
4 |
> NULL | 4 | Using index; Distinct |
>
+--------------------+--------+-----------------------+---------+---------+----------------+-------+------------------------
>
> I need to be able to run the full query on a daily basis without killing
the
> DB engine.
>
> The query needs to pull in about 50,000 results.
>
> Does anyone see a way to optimize this query or rewrite it so it doesn't
cause
> a huge system load?
>
> Thank you,
>
>
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