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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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Fun fact: Nothing's launch event will be held just one day after Apple's 'special experience' event, where the company is expected to launch a multitude of new products (as referenced by Nothing CEO Carl Pei's cheeky tweet). As we've said in our recent MWC overview, it's going to be a busy couple of weeks for gadget lovers.，这一点在heLLoword翻译官方下载中也有详细论述