原始表结构
SELECT ProvinceName,CityName,DistrictName FROM AREA
1、CONCAT函数
SELECT CONCAT(ProvinceName,CityName,DistrictName) FROM AREA
2、CONCAT_WS函数
SELECT CONCAT_WS('-',ProvinceName,CityName,DistrictName) FROM AREA
3、GROUP_CONCAT
SELECT CityName,GROUP_CONCAT(DistrictName) FROM AREA GROUP BY cityId
