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.
Россия вышла из соглашения с ООН14:29。业内人士推荐新收录的资料作为进阶阅读
。新收录的资料对此有专业解读
Борющаяся с раком Симоньян высказалась о проведении прощального вечера18:00
PIXELS_NETWORK_EGRESS。新收录的资料是该领域的重要参考
Globally, lamb consumption is expected to grow by 15% between now and 2032, according to a report from the Organisation for Economic Co-operation and Development and the Food and Agriculture Organization.