[ITmedia ビジネスオンライン] 懐かしの「屋上遊園地」、なぜ今復活? 松坂屋の“逆張り戦略”

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元宵节的桥,和平常日子里的桥,也许并没有什么不一样。但是在元宵节这一天,人们心头更多地涌出向往的情感和追求的梦想,带着情感,带着梦想,踏上那一座座桥,开启生活新的一页。这日子连接着旧与新,连接着付出和收获,连接着昨天、今天和明天。

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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.