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三级联动(数据库设计)

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Release： 2016-06-07 16:01:09
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第一步骤：建表语句，等级分明、三个级别当创建三张表。 第二步骤：插入省份信息表数据。 第三步骤：插入城市信息表数据。 第四步骤：插入区县信息表数据。

第一步骤：建表语句，等级分明、三个级别当创建三张表。

第二步骤：插入省份信息表数据。

第三步骤：插入城市信息表数据。

第四步骤：插入区县信息表数据。

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