mongodb add unique key
For example, to create a unique index on the user_id field of the members ... then MongoDB will enforce uniqueness on the combination of the index key values. ,If you cannot use a unique field as the shard key or if you need to enforce uniqueness over multiple fields, you must create another collection to act as a “proxy ... ,Specify true to create a unique index. ... For a compound index that includes 2dsphere index key(s) along with keys of other types, only the 2dsphere index fields ... ,MongoDB creates a unique index on the _id field during the creation of a ... In sharded clusters, if you do not use the _id field as the shard key, then your ... ,mongoDB可以建立index以利未來的searching，在以後searching時如果 ... 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 .... 請注意每當有資料被insert或delete時，indexes就會被update，所以當你的DB很常 ... , You can do it by creating a unique index for your email field. http://docs.mongodb.org/manual/tutorial/create-a-unique-index/. Scott., For anyone else having issues, also take note that field names are case sensitive. So creating an index on field1 : 1} is not the same as Field1 ...,MongoDB cannot create a unique index on the specified index field(s) if the collection already contains data that would violate the unique constraint for the index ... ,For example, you may want to create a unique index on the "tax-id": of the accounts collection to prevent storing multiple account records for the same legal ...
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 mongodb add unique key 相關參考資料
Unique Indexes — MongoDB Manual
For example, to create a unique index on the user_id field of the members ... then MongoDB will enforce uniqueness on the combination of the index key values. https://docs.mongodb.com Unique Constraints on Arbitrary Fields — MongoDB Manual
If you cannot use a unique field as the shard key or if you need to enforce uniqueness over multiple fields, you must create another collection to act as a “proxy ... https://docs.mongodb.com db.collection.createIndex() — MongoDB Manual
Specify true to create a unique index. ... For a compound index that includes 2dsphere index key(s) along with keys of other types, only the 2dsphere index fields ... https://docs.mongodb.com Indexes — MongoDB Manual
MongoDB creates a unique index on the _id field during the creation of a ... In sharded clusters, if you do not use the _id field as the shard key, then your ... https://docs.mongodb.com [mongoDB]index功能的筆記@ 雷伊的工作心得:: 隨意窩Xuite日誌
mongoDB可以建立index以利未來的searching，在以後searching時如果 ... 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 .... 請注意每當有資料被insert或delete時，indexes就會被update，所以當你的DB很常 ... https://blog.xuite.net How to make user's email unique in mongoDB? - Stack Overflow
You can do it by creating a unique index for your email field. http://docs.mongodb.org/manual/tutorial/create-a-unique-index/. Scott. https://stackoverflow.com Mongodb- Add unique index on an existing collection - Stack Overflow
For anyone else having issues, also take note that field names are case sensitive. So creating an index on field1 : 1} is not the same as Field1 ... https://stackoverflow.com 唯一索引— MongoDB Manual 3.4 - MongoDB中文社区
MongoDB cannot create a unique index on the specified index field(s) if the collection already contains data that would violate the unique constraint for the index ... http://www.mongoing.com Create a Unique Index — MongoDB Manual 2.4.14
For example, you may want to create a unique index on the "tax-id": of the accounts collection to prevent storing multiple account records for the same legal ... http://www.dba86.com |