请问，云开发，json数据库，有没有外键的概念？
如果有外键概念，多collection查询问题可以实现么？
如果没有外键概念，那会不会出现数据不一致的情况？
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- project.miniapp.json: Mini Program/Development/Extended/Must Read Before Development/project.miniapp.json
- project.miniapp.json#XI. LBS: Mini Program/Development/Extended/Must Read Before Development/project.miniapp.json
- project.miniapp.json#II. SDK version: Mini Program/Development/Extended/Must Read Before Development/project.miniapp.json
- project.miniapp.json#III. CPU type: Mini Program/Development/Extended/Must Read Before Development/project.miniapp.json
- project.miniapp.json#VI. Application Icons: Mini Program/Development/Extended/Must Read Before Development/project.miniapp.json
联表查询可以使用lookup哦
https://developers.weixin.qq.com/miniprogram/dev/wxcloud/reference-sdk-api/database/aggregate/Aggregate.lookup.html
参考mongodb