On Friday 04 April 2003 12:19, Ian Hartas wrote:

> >You can't add constraints referencing indices that don't exist.
> >Create your  indecies first.
>
> Constraints don't reference indexes, they reference columns.
> These columns exist.  When the table type is MyISAM, the syntax
> is accepted. When it's InnoDB - it fails.
> (
> This schema was originally on Oracle, where the syntax was valid and
> acted on.)

MyISAM table doesn't support FOREIGN KEY constraints.
InnoDB does. But both columns must be undexed, please read more in the manual:
        http://www.mysql.com/doc/en/SEC463.html


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