forward engineer with mysql workbench cannot create the schema - mysql-workbench

Question

-- MySQL Workbench Forward Engineering
SET #OLD_UNIQUE_CHECKS=##UNIQUE_CHECKS, UNIQUE_CHECKS=0;
SET #OLD_FOREIGN_KEY_CHECKS=##FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET #OLD_SQL_MODE=##SQL_MODE, SQL_MODE='TRADITIONAL,ALLOW_INVALID_DATES';
-- -----------------------------------------------------
-- Schema motivian
-- -----------------------------------------------------
-- -----------------------------------------------------
-- Schema motivian
-- -----------------------------------------------------
CREATE SCHEMA IF NOT EXISTS `motivian` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ;
USE `motivian` ;
-- -----------------------------------------------------
-- Table `motivian`.`user`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `motivian`.`user` ;
CREATE TABLE IF NOT EXISTS `motivian`.`user` (
`user_id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
`username` VARCHAR(100) NOT NULL,
`email` VARCHAR(100) NULL,
`password` VARCHAR(100) NOT NULL,
UNIQUE INDEX `username_UNIQUE` (`username` ASC),
PRIMARY KEY (`user_id`));
-- -----------------------------------------------------
-- Table `motivian`.`calculation`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `motivian`.`calculation` ;
CREATE TABLE IF NOT EXISTS `motivian`.`calculation` (
`category_id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
`calc` VARCHAR(100) NOT NULL,
`user_id` INT NULL,
`date_created` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`category_id`),
CONSTRAINT `user_id`
FOREIGN KEY ()
REFERENCES `motivian`.`user` ()
ON DELETE NO ACTION
ON UPDATE NO ACTION);
SET SQL_MODE=#OLD_SQL_MODE;
SET FOREIGN_KEY_CHECKS=#OLD_FOREIGN_KEY_CHECKS;
SET UNIQUE_CHECKS=#OLD_UNIQUE_CHECKS;
This is auto generated with mysql workbench but the constraint could not be applied. I tried like this:
CONSTRAINT user_id
FOREIGN KEY (user_id)
REFERENCESmotivian.user(user_id)
ON DELETE NO ACTION
ON UPDATE NO ACTION);
but also don't work.....
This is the error:
Executing SQL script in server
ERROR: Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')
REFERENCES `motivian`.`user` ()
ON DELETE NO ACTION
ON UPDATE NO A' at line 8
SQL Code:
CREATE TABLE IF NOT EXISTS `motivian`.`calculation` (
`category_id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
`calc` VARCHAR(100) NOT NULL,
`user_id` INT NULL,
`date_created` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`category_id`),
CONSTRAINT `user_id`
FOREIGN KEY ()
REFERENCES `motivian`.`user` ()
ON DELETE NO ACTION
ON UPDATE NO ACTION)
SQL script execution finished: statements: 8 succeeded, 1 failed
Fetching back view definitions in final form.
Nothing to fetch

Answer 1

Your FK definition is incomplete. Youd did not specify any column. Select your foreign key in the table editor and specify column pairs in the list right to it: