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.
«Это отчетливый затхлый, слегка металлический и сухой запах, который исчезает по мере выздоровления. Впервые я заметила эту свою способность после пребывания в больнице в подростковом возрасте, и с годами поняла, что она удивительно устойчива», — написала девушка.
这就涉及到现代物理学中最关键的常数之一——精细结构常数。。关于这个话题，体育直播提供了深入分析
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Graceware’s entry in Ukie’s member database is misspelled and links to a dead website.