--约束：对列的值起一个约束性的作用，规定列的值的范围
--主键、外键、非空、自增长标识列、唯一列(unique)、check约束 --check 约束
--在某个表里点击右键→设计→进去找到要约束的列点击右键→添加→写表达式(表达式必须以列名开头)
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