通过检查两列数据来更新mysql

Question

UPDATE city_final SET city_final.distance=500000, where city_final.fromcountryID =1 and city_final.tocountryID!=1

我想通过检查列中的distance =500000来更新countryID 什么是thids查询的错误

Answer 1

在city_final.distance=500000

之后删除逗号

UPDATE city_final 
SET city_final.distance=500000
where city_final.fromcountryID =1 and city_final.tocountryID!=1