mysql - 连接MySQL中的3个表以选择字段

Question

我的数据库结构如下图所示

我想选择所有的分区，包括分区名称、城市名称和省份名称。我的代码是这样的:

SELECT province.name as province, city.name as city, subdistrict.name as subdistrict 
    from provinces province, cities city, subdistricts subdistrict 
    WHERE province.id = city.id AND city.id = subdistrict.id;

但我只得到了省份数据的总数，而不是所有街道数据

Answer 1

您的基本 SQL 缺少逗号，但通常应该可以工作。我强烈建议使用更现代的连接语法:-

SELECT province.name AS province, 
        city.name AS city, 
        subdistrict.name AS subdistrict 
FROM provinces province
INNER JOIN cities city
ON province.id = city.id 
INNER JOIN subdistricts subdistrict 
ON city.id = subdistrict.id;

但是，根据您的描述，我不确定您是否正在尝试进行一些聚合处理？