Ketan jagung is traditional food in Java made from cooked glutinous rice and corn serve with grated coconut. Usually for breakfast and accompanied by tea or coffee,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视
运用方法:DBCollection对象方法中的 distinct() 语句: 语句结构:distinct(key,[query]) key字符串,指定获取哪个字段的不同值;query:包含标准查询选项的对象,指定了要从哪个文档中获取不同的字段值 举例说明: 如下是 inventory 集合的数据 { "_id": 1, "dept": "A", "item": { "sku": "111", "color"...