Cross-Join: All row by all row, ex: SELECT FROM , <\/p>\n
The Equi-Join or Inner Join:Syntax:
SELECT
FROM ,
WHERE (Table1.column = Table2.column)<\/p>\n
SELECT cds.artist, cds.title, genres.genre
-> FROM cds, genres
-> WHERE (cds.genreID = genres.genreID);<\/p>\n
The Left Join:Syntax:<\/p>\n
SELECT
FROM
LEFT JOIN
ON Table1.column = Table2.column<\/p>\n
Without adding a WHERE clause the Left Join produces the same results as the equi-join example above.
mysql> SELECT cds.artist, cds.title, genres.genre
-> FROM cds
-> LEFT JOIN genres
-> ON cds.genreID = genres.genreID; <\/p>\n
The USING Clause: You can use this if the columns you are carrying out the join on have the same name.
Syntax:<\/p>\n
SELECT
FROM
LEFT JOIN
USING ()<\/p>\n
UPDATE JOIN:<\/p>\n
mysql> UPDATE cds, artists
-> SET
-> cds.title = ‘The Funkship Odyssey’,
-> artists.Artist = ‘George Clinton’
-> WHERE (artists.artistID = cds.artistID)
-> AND (cds.cdID = ‘2’);<\/p>\n
UPDATE cds->LEFT JOIN artists
-> ON cds.artistID = artists.artistID
-> SET
-> cds.title = ‘A Funk Odyssey’,
-> artists.name = ‘Jamiroquai’
-> WHERE (cds.cdID = ‘2’);<\/p>\n
DELETE Joins:mysql> DELETE cds
-> FROM cds, artists
-> WHERE (cds.artistID = artists.artistID)
-> AND (cds.artistID = ‘3’);<\/p>\n
From: http:\/\/sitestree.com\/?p=4722
Categories:5
Tags:
Post Data:2010-05-28 12:14:38<\/p>\n
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