CREATE TABLE $`$article$`($

$`$id$`$ varchar$(10)$ NOT NULL,

$`$volname$`$ varchar$(100)$ DEFAULT NULL,

$`$volid$`$ varchar$(20)$ DEFAULT NULL,

$`$title$`$ varchar$(500)$ NOT NULL,

$`$bodyText$`$ text NOT NULL,

$`$correspAut$`$ varchar$(200)$ DEFAULT NULL,

$`$submissionDate$`$ date DEFAULT NULL,

$`$result$`$ varchar$(10)$ DEFAULT NULL,

PRIMARY KEY $(`$id$`),$

KEY $`$volname$`(`$volname$`,`$volid$`),$

KEY $`$correspAut$`(`$correspAut$`)$

$)$ ENGINE$=$InnoDB DEFAULT CHARSET$=$utf$8$mb$4$ COLLATE$=$utf$8$mb$4\_$general$\_$ci;

CREATE TABLE $`$articlekeywords$`($

$`$email$`$ varchar$(200)$ NOT NULL,

$`$aid$`$ varchar$(10)$ NOT NULL,

PRIMARY KEY $(`$email$`,`$aid$`),$

KEY $`$aid$`(`$aid$`)$

$)$ ENGINE$=$InnoDB DEFAULT CHARSET$=$utf$8$mb$4$ COLLATE$=$utf$8$mb$4\_$general$\_$ci;

CREATE TABLE $`$person$`($

$`$email$`$ varchar$(200)$ NOT NULL,

$`$name$`$ varchar$(200)$ DEFAULT NULL,

$`$vname$`$ varchar$(100)$ NOT NULL,

$`$vid$`$ varchar$(20)$ NOT NULL,

$`$isAuthor$`$ tinyint$(1)$ DEFAULT NULL,

$`$isEditor$`$ tinyint$(1)$ DEFAULT NULL,

$`$isReviewer$`$ tinyint$(1)$ DEFAULT NULL,

PRIMARY KEY $(`$email$`,`$vname$`,`$vid$`),$

KEY $`$vname$`(`$vname$`,`$vid$`)$

$)$ ENGINE$=$InnoDB DEFAULT CHARSET$=$utf$8$mb$4$ COLLATE$=$utf$8$mb$4\_$general$\_$ci;

ALTER TABLE $`$articlekeywords$`$

ADD CONSTRAINT $`$articlekeywords$\_$ibfk$\_1`$ FOREIGN KEY $(`$keywid$`)$ REFERENCES $`$keywords$`(`$keywid$`),$

ADD CONSTRAINT $`$articlekeywords$\_$ibfk$\_2`$ FOREIGN KEY $(`$aid$`)$ REFERENCES $`$article$`(`$id$`)$;

i got error message for alter table on mysql workbench $,$ how can i fix that