MongoDB之數據查詢（嵌套集合）

在MongoDB數據庫裏面每個集合數據能夠繼續保存其餘的集合數據，例若有些人員保存家庭信息。 範例：增長數據 db.emp.insert({"name":"林A","sex":"男","age":22,"sal":8000,"loc":"北京","course":["語文","數學","英語","音樂","政治"],"parents":[{"name":"林A父親","age":50,"job":

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