Question

在MySQL的Sample Salika（DVD Rental）数据库中，工作人员的表有一个外键是商店字段的表，商店的外键有一个外键是商店字段的表，怎么样要创建表而不删除一个外键，我使用的是MySQLWorkbench。

    CREATE TABLE staff (
  staff_id     TINYINT     UNSIGNED NOT NULL AUTO_INCREMENT,
  first_name   VARCHAR(45) NOT NULL,
  last_name    VARCHAR(45) NOT NULL,
  address_id   SMALLINT    UNSIGNED NOT NULL,
  picture      BLOB        DEFAULT NULL,           -- Kept a picture as BLOB (up to 64KB)
  email        VARCHAR(50) DEFAULT NULL,
  store_id     TINYINT     UNSIGNED NOT NULL,
  active       BOOLEAN     NOT NULL DEFAULT TRUE,  -- BOOLEAN FALSE (0) TRUE (non-0)
  username     VARCHAR(16) NOT NULL,
  password     VARCHAR(40) BINARY DEFAULT NULL,    -- BINARY??
  last_update  TIMESTAMP   NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY  (staff_id),
  KEY idx_fk_store_id (store_id),
  KEY idx_fk_address_id (address_id),
  CONSTRAINT fk_staff_store FOREIGN KEY (store_id) REFERENCES store (store_id)
    ON DELETE RESTRICT ON UPDATE CASCADE,
  CONSTRAINT fk_staff_address FOREIGN KEY (address_id) REFERENCES address (address_id)
    ON DELETE RESTRICT ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE store (
  store_id          TINYINT    UNSIGNED NOT NULL AUTO_INCREMENT,
  manager_staff_id  TINYINT    UNSIGNED NOT NULL,
  address_id        SMALLINT   UNSIGNED NOT NULL,
  last_update       TIMESTAMP  NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (store_id),
  UNIQUE KEY idx_unique_manager (manager_staff_id),  -- one manager manages only one store
  KEY idx_fk_address_id (address_id),
  CONSTRAINT fk_store_staff FOREIGN KEY (manager_staff_id) REFERENCES staff (staff_id) 
    ON DELETE RESTRICT ON UPDATE CASCADE,
  CONSTRAINT fk_store_address FOREIGN KEY (address_id) REFERENCES address (address_id) 
    ON DELETE RESTRICT ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

表人员和商店都有其他的外键，如何创建表而不删除一个外键

0 个答案: