unique index mongodb
A unique index ensures that the indexed fields do not store duplicate values; i.e. enforces uniqueness for the indexed fields. By default, MongoDB creates a ... , MongoDB unique index实战Part1:写在最前MongoDB的unique index索引这里有个注意事项，主要体现在对NULL值的处理上，本文加以复现。, You can do it by creating a unique index for your email field. http://docs.mongodb.org/manual/tutorial/create-a-unique-index/. Scott., 如果在Collection上有合適的Index，例如，unique index，那麼MongoDB在按照index key查找到一個doc之後，就不會繼續對其他doc查詢，極大地 ...,If you cannot use a unique field as the shard key or if you need to enforce uniqueness ... Use the following command to create a unique index on the email field:. ,Parameter, Type, Description. field, string, The field for which to return distinct values. query, document, A query that specifies the documents from which to ... ,mongoDB可以建立index以利未來的searching，在以後searching時如果 ... 以上的情況稱之為unique index，使用者必須要確保field裡的值沒有互相衝到，在default的 ... ,A unique index ensures that the indexed fields do not store duplicate values; i.e. enforces uniqueness for the indexed fields. By default, MongoDB creates a ... ,MongoDB creates a unique index on the _id field during the creation of a collection. The _id index prevents clients from inserting two documents with the same ... ,Creates a unique index so that the collection will not accept insertion or update of documents where the index key value matches an existing value in the index.
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 unique index mongodb 相關參考資料
唯一索引— MongoDB Manual 3.4 - MongoDB中文社区
A unique index ensures that the indexed fields do not store duplicate values; i.e. enforces uniqueness for the indexed fields. By default, MongoDB creates a ... http://www.mongoing.com MongoDB unique index-贺磊的技术博客-51CTO博客
MongoDB unique index实战Part1:写在最前MongoDB的unique index索引这里有个注意事项，主要体现在对NULL值的处理上，本文加以复现。 https://blog.51cto.com 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 使用Index - 每日頭條
如果在Collection上有合適的Index，例如，unique index，那麼MongoDB在按照index key查找到一個doc之後，就不會繼續對其他doc查詢，極大地 ... https://kknews.cc 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 ... Use the following command to create a unique index on the email field:. https://docs.mongodb.com db.collection.distinct() — MongoDB Manual
Parameter, Type, Description. field, string, The field for which to return distinct values. query, document, A query that specifies the documents from which to ... 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 ... 以上的情況稱之為unique index，使用者必須要確保field裡的值沒有互相衝到，在default的 ... https://blog.xuite.net Unique Indexes — MongoDB Manual
A unique index ensures that the indexed fields do not store duplicate values; i.e. enforces uniqueness for the indexed fields. By default, MongoDB creates a ... https://docs.mongodb.com Indexes — MongoDB Manual
MongoDB creates a unique index on the _id field during the creation of a collection. The _id index prevents clients from inserting two documents with the same ... https://docs.mongodb.com db.collection.createIndex() — MongoDB Manual
Creates a unique index so that the collection will not accept insertion or update of documents where the index key value matches an existing value in the index. https://docs.mongodb.com |