sql - Syntax error creating table in MySQL database -

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i'm getting syntax error when i'm trying create table in mysql database, around mediumblob, can me?

create table  `elo`.`images` (   `image_id` varchar( 50 ) not null ,  `user_id` varchar( 50 ) not null ,  `image` mediumblob(16777215) not null ,  `longitude` varchar( 15 ) not null ,  `latitude` varchar( 15 ) not null ,  `city` varchar( 50 ) not null ,  `delete_at` datetime not null ,  `description` varchar( 250 ) not null ,  `score` int( 8 ) not null default  '0',  `categories` set(  'nightlife',  'food',  'beach' ) not null default  'nightlife', primary key (  `image_id` ) , unique (  `image` ) ) engine = myisam

you can't set length mediumblob column should defined image mediumblob not null, means can't set unique don't have length sql should this

create table  `images` (  `image_id` varchar( 50 ) not null ,  `user_id` varchar( 50 ) not null ,  `image` mediumblob not null,  `longitude` varchar( 15 ) not null ,  `latitude` varchar( 15 ) not null ,  `city` varchar( 50 ) not null ,  `delete_at` datetime not null ,  `description` varchar( 250 ) not null ,  `score` int( 8 ) not null default  '0',  `categories` set(  'nightlife',  'food',  'beach' ) not null default  'nightlife',  primary key (  `image_id` )  ) engine = myisam

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