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.
22:09, 27 февраля 2026Бывший СССР
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。体育直播对此有专业解读
透過在入睡時播放詩歌錄音，多德發現自己的夢境變得極為生動：穿越被洪水毀滅的神秘城市、或在月光照耀的海浪上和狐狸並肩奔馳。
（二）海上保险事故发生在被保险人已纠正违反保证条款的行为之后。。体育直播对此有专业解读