相机：观众的眼睛。这里用的是 PerspectiveCamera（透视相机）。
Since Mongo is a NoSQL database, it has its own JavaScript-like query language to work with data. As Postgres is an SQL database, it needed to adopt SQL to allow for working with JSON data - it has its own rich set of JSON functions and operators. Let's compare two contenders by going through lots of practical examples.，这一点在旺商聊官方下载中也有详细论述
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