In the previous example we considered a space which has only one road looping back on itself. The number of times you would walk around the road to get back to the “same” point (or an equivalent point in a different copy) can be encoded using this “winding number” trick:
ConclusionAs we have seen, Postgres is more than able to rival Mongo when it comes to handling data of the JSON documents type.
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最后是 Thumbs.db 文件。Thumbs（缩写自 thumbnails）即缩略图数据库，这是一种 Windows 系统文件，采用 OLE 复合文档结构。它用于储存文件夹中图像和视频的缩略图预览缓存，以加速 Windows 资源管理器对缩略图的加载。