dar permiso limitado a un campo

[jurena]

Esto está sacado del manual:

Column level
Column privileges apply to single columns in a given table. These privileges are stored in the mysql.columns_priv table. When using REVOKE, you must specify the same columns that were granted. The column or columns for which the privileges are to be granted must be enclosed within parentheses.
GRANT SELECT (col1), INSERT (col1,col2) ON mydb.mytbl TO 'someuser'@'somehost';

http://dev.mysql.com/doc/refman/5.1/en/grant.html