三级联动(数据库设计)
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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