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.
‘The professional game must evolve if it is to thrive’
第一百六十四条 海上拖航合同，是指承拖方用拖轮将被拖物经海路从一地拖至另一地，而由被拖方支付拖航费的合同。，这一点在heLLoword翻译官方下载中也有详细论述
At the other end of the scale, the technology could also be used to make tiny structures that, when activated, open up and deliver drugs to specific sites in the body. Zaman says he and his colleagues are now collaborating on research in this area.。关于这个话题，体育直播提供了深入分析
Мощный удар Израиля по Ирану попал на видео09:41，这一点在im钱包官方下载中也有详细论述
‘암살자’ B-2 이어 ‘죽음의 백조’ B-1B 떴다…美 “이란 미사일시설 초토화”