The negative ("This option may NOT be specified...") - urrgh... semantics. Does it mean that it can be but that you shouldn't because it doesn't make sense but it is allowed anyway?
To my surprise, the syntax for CREATE TABLE and ALTER TABLE does allow you to specify the IGNORE_DUP_KEY option for PRIMARY KEY and UNIQUE constraints.
Just the same Hugo - good question. It looks closely at an issue that is odd at best. Thanks
Jamie