MongoDB修改、删除文档的域属性实例 在网站的开发中，可能最初的设计不合理，或者后期业务的变更，会造成文档结构会有些没用的属性，需要去删除或修改，由于MongoDB 是无 Schema 的，不像关系数据库那样列属性定义在表而非记录中，MongoDB 的集合中的每个文档可以拥有各自不同的域属性。MongoDB 中使用 db.collections.update 修改集合中若干文档的...
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