为什么Postgresql说“架构不存在”

如何让这个查询起作用？

SELECT weather.id,cities.name,weather.date,weather.degree
FROM weather JOIN weather.city_id ON cities.id
WHERE weather.date = '2011-04-30';

错误：架构“天气”不存在.@H_502_4@

天气不是架构,它是一张桌子！@H_502_4@

也许：

SELECT weather.id,weather.degree 
FROM weather JOIN cities ON (weather.city_id = cities.id)
WHERE weather.date = '2011-04-30';

postgres抱怨关于weather.city_id的加入,这被解释为模式’weather’中名为’city_id’的表/视图@H_502_4@