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mysql小白-添加复杂约束的语法

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mysql小白-添加复杂约束的语法

需求：往 student表 中添加 邮政编码postcode列
要求：字符型，长度为6，可以为空，若不为空则要求postcode只能为数字，不能为其他字符


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你这用程序来约束不好吗


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