ALTER TABLE ADD 增加多个字段 外键约束

/* 创建表 及设置 主键 */
 CREATE TABLE TABLE_USER
(
 USER_ID INT IDENTITY(1,1) NOT NULL,
 USER_NAME NVARCHAR(40) NOT NULL,
 LAST_UPDATED_BY    NVARCHAR(15),
 LAST_UPDATED_DATE    DATETIME,
CONSTRAINT USER_PK PRIMARY KEY (USER_ID)
);


/*ALTER TABLE 增加多个字段 */
ALTER TABLE TABLE_USER ADD 
 DEPARTMENT_ID INT NOT NULL
,COMPANY_ID INT NOT NULL
,TEMP_COL NVARCHAR(10)
;


/*ALTER TABLE 增加多个外键 */
ALTER TABLE TABLE_USER ADD 
CONSTRAINT USER_DEPARTMENT_FK FOREIGN KEY(DEPARTMENT_ID) REFERENCES TABLE_DEPARTMENT(DEPARTMENT_ID) 
,CONSTRAINT USER_COMPANY_FK FOREIGN KEY(COMPANY_ID) REFERENCES TABLE_COMPANY(COMPANY_ID) 
 ;


/*ALTER TABLE 删除字段 */
ALTER TABLE TABLE_USER DROP COLUMN TEMP_COL;