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UPDATE db1.table1 JOIN db2.table2
ON db1.table1.field = db2.table2.field
SET db1.table1.field = db2.table2.field

Concrete example : I am reinstalling a mail server and I need passwords from the old, clumsy, ISPConfig install to copy to my new, small, neat table :

UPDATE users JOIN dbispconfig.mail_user 
ON     users.email = dbispconfig.mail_user.email 
SET    users.password = dbispconfig.mail_user.password
Query OK, 21 rows affected (0.05 sec)
Rows matched: 442  Changed: 21  Warnings: 0

contact : @ychaouche yacinechaouche at yahoocom

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