NoSQL 新手，对创建集合有点困惑

Question

我是一名刚刚开始使用 NoSQL 的学生，但它并不适合我。我在几点上有点困惑。任何帮助将不胜感激 1.Can 文档属于多个集合？

2.Have 我创建集合的语法正确吗？ pic 是集合 er 而 a 只是完整 er 的一个片段。

db.Animal.insert ( {
 “animal_ID” : “XXXXXXX “,      
 “common_name” :  “Red Squirrel”,
 “IUCN” : “Least Concern (declining)”,
 “photo” :  “qs451xkx6qf4j”,
   “extinct” : {    
     “when” : “null “,
     “reason” : “null”
},
        “invasive” : {
            “threat_level” : “null”,
            “threat” : “null”,
            “how_to_help” : “null”
},
         “native” : {
            “endangerment” : “population declining“,
            “how_to_help” : “providing a little                     extra food, planting some red squirrel-friendly  shrubs and reporting any red or grey squirrel activity”
},
“Fact_sheet” : “{
   “fact_id” : “ “,
   “animal_id” : “ XXXXXXX “,
   “order” : “ Rodentia “,
   “family” : “Sciuridae “ ,
   “species” : “Sciurus vulgaris “ ,
   “size” : “body length 19 to 23 cm, tail length 15   to 20 cm “ ,
   “weight” : “250 to 340 g “ ,
   “lifespan” : “3 years , 7 to 10 in captivity “ ,
   “extra” : “In Norse mythology, Ratatoskr is a red squirrel who runs up and down with messages in the world tree, Yggdrasil, and spreads gossip “ ,
    “habitat” : { [
       “name” : “woodland “, 
       “description” : “a low-density forest   forming open habitats with plenty of sunlight and limited shade “
]
});

Answer 1

Can documents belong to multiple collections?

在MongoDB中，没有。在其他数据库中，我不知道。

2.Have I the correct syntax here for creating the Collection?

要创建一个集合，您可以使用 https://docs.mongodb.com/manual/reference/method/db.createCollection/。此调用还允许您传递各种收集选项。

您正在插入文档。在MongoDB插入文档时，如果目标集合不存在，则由服务器自动创建。

NoSQL 新手，对创建集合有点困惑

New to NoSQL and a little confused with creating collections

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