Cross-Join: All row by all row, ex: SELECT FROM ,
The Equi-Join or Inner Join:Syntax:
SELECT
FROM ,
WHERE (Table1.column = Table2.column)
SELECT cds.artist, cds.title, genres.genre
-> FROM cds, genres
-> WHERE (cds.genreID = genres.genreID);
The Left Join:Syntax:
SELECT
FROM
LEFT JOIN
ON Table1.column = Table2.column
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;
The USING Clause: You can use this if the columns you are carrying out the join on have the same name.
Syntax:
SELECT
FROM
LEFT JOIN
USING ()
UPDATE JOIN:
mysql> UPDATE cds, artists
-> SET
-> cds.title = ‘The Funkship Odyssey’,
-> artists.Artist = ‘George Clinton’
-> WHERE (artists.artistID = cds.artistID)
-> AND (cds.cdID = ‘2’);
UPDATE cds->LEFT JOIN artists
-> ON cds.artistID = artists.artistID
-> SET
-> cds.title = ‘A Funk Odyssey’,
-> artists.name = ‘Jamiroquai’
-> WHERE (cds.cdID = ‘2’);
DELETE Joins:mysql> DELETE cds
-> FROM cds, artists
-> WHERE (cds.artistID = artists.artistID)
-> AND (cds.artistID = ‘3’);
From: http://sitestree.com/?p=4722
Categories:5
Tags:
Post Data:2010-05-28 12:14:38
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