MongoDB之数据查询（嵌套集合）

在MongoDB数据库里面每个集合数据能够继续保存其余的集合数据，例若有些人员保存家庭信息。 范例：增长数据 db.emp.insert({"name":"林A","sex":"男","age":22,"sal":8000,"loc":"北京","course":["语文","数学","英语","音乐","政治"],"parents":[{"name":"林A父亲","age":50,"job":

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