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Collections of Documents on the other hand, offer a much more relaxed approach. Collections are just namespaces where we insert documents. Documents are objects of any schema and format; but in practice, it almost always is JSON. There are no enforced types, no constraints, no guarded references between documents in different collections. In the same collection, we might have documents of completely different schema - flexibility and openness to any data and column types rules here. In tables, rows have columns of simple, scalar types (mostly) - numbers, ids, strings, dates, timestamps and so on. In collections, documents have fields comprising both simple and composite types like arrays and other documents, nested inside. Same field in different documents, but still of the same collection, might have different types as well - almost anything is allowed here.
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Cheong believes Kim is trying to avoid such a rapid transition by introducing Ju Ae early to the regime and the public.，详情可参考体育直播
However, the platform said it was now developing "more verification options" for users that would not require facial or ID scans. One such option in development is credit card verification.，更多细节参见下载安装汽水音乐
Фото: Kuba Stezycki / Reuters