mongodb primary key
The field name _id is reserved for use as a primary key; its value must be unique in the collection, is immutable, and may be of any type other than an array. , _id field is reserved for primary key in mongodb, and that should be a unique value. If you don't set anything to _id it will automatically fill it with ...,Primary key constraint in Relational database facilitates identification of unique row in a database table. In Mongodb _id field belonging to BSON document is ... , , ... 儲存解決方案。MongoDB 將資料儲存為一個文件，資料結構由鍵值(key. ... primary key, primary key, 主鍵,MongoDB自動將_id欄位設定為主鍵 ..., MongoDB 是一套open source 的NoSQL DB。MongoDB 本身是 ... In MongoDB, the primary key is automatically set to the _id field. aggregation ...,row, document, 数据记录行/文档. column, field, 数据字段/域. index, index, 索引. table joins, 表连接,MongoDB不支持. primary key, primary key, 主键,MongoDB自动 ... ,copied. db.collection.createIndex( <key and index type specification>, unique: true } ) ... createIndex() on the primary for a replica set, or; issuing db.collection. ,在預設的情況下，_id欄位一開始就己經是index，同時_id也是primary key，如果一筆資料沒有指定_id的值，那麼系統會配給他一個12-byte的值（資料型態為ObjectID） ...
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 mongodb primary key 相關參考資料
Documents — MongoDB Manual
The field name _id is reserved for use as a primary key; its value must be unique in the collection, is immutable, and may be of any type other than an array. https://docs.mongodb.com How to set a primary key in MongoDB? - Stack Overflow
_id field is reserved for primary key in mongodb, and that should be a unique value. If you don't set anything to _id it will automatically fill it with ... https://stackoverflow.com How to set primary key in mongodb and how to confirm the primary ...
Primary key constraint in Relational database facilitates identification of unique row in a database table. In Mongodb _id field belonging to BSON document is ... https://www.quora.com Mongodb Primary Key: Example to set _id field with ObjectId()
https://www.guru99.com MongoDB 入門教程| 程式前沿
... 儲存解決方案。MongoDB 將資料儲存為一個文件，資料結構由鍵值(key. ... primary key, primary key, 主鍵,MongoDB自動將_id欄位設定為主鍵 ... https://codertw.com MongoDB 學習筆記之二- MongoDB 簡介 - 網路技術趨勢觀測站
MongoDB 是一套open source 的NoSQL DB。MongoDB 本身是 ... In MongoDB, the primary key is automatically set to the _id field. aggregation ... http://garyliutw.blogspot.com MongoDB 概念解析| 菜鸟教程
row, document, 数据记录行/文档. column, field, 数据字段/域. index, index, 索引. table joins, 表连接,MongoDB不支持. primary key, primary key, 主键,MongoDB自动 ... http://www.runoob.com Unique Indexes — MongoDB Manual
copied. db.collection.createIndex( <key and index type specification>, unique: true } ) ... createIndex() on the primary for a replica set, or; issuing db.collection. https://docs.mongodb.com [mongoDB]index功能的筆記@ 雷伊的工作心得:: 隨意窩Xuite日誌
在預設的情況下，_id欄位一開始就己經是index，同時_id也是primary key，如果一筆資料沒有指定_id的值，那麼系統會配給他一個12-byte的值（資料型態為ObjectID） ... https://blog.xuite.net |