mongodb constraints
沒有這個頁面的資訊。瞭解原因 ,2012年9月23日 — Being a "schemaless" database, some of the things you mention must be constrained from the application side, rather than the db side.
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 mongodb constraints 相關參考資料
Documents — MongoDB Manual
The _id field has the following behavior and constraints: By default, MongoDB creates a unique index on the _id field during the creation of a collection. The _id ... https://docs.mongodb.com Functions - MongoDB Documentation
沒有這個頁面的資訊。瞭解原因 https://docs.mongodb.com How to apply constraints in MongoDB? - Stack Overflow
2012年9月23日 — Being a "schemaless" database, some of the things you mention must be constrained from the application side, rather than the db side. https://stackoverflow.com How to apply constraints on the documents inside a collection ...
You can't. That's the nature of MongoDB. It just stores the JSON blob that you give it. There is no constraint-checking within an object itself. MongoDB just ... https://www.quora.com Indexes — MongoDB Manual
... to reject duplicate values for the indexed field. Other than the unique constraint, unique indexes are functionally interchangeable with other MongoDB indexes. https://docs.mongodb.com MongoDB Limits and Thresholds — MongoDB Manual
Unique Constraints on Arbitrary Fields for an alternate approach. Maximum Number of Documents Per Chunk to Migrate ¶. By default, MongoDB cannot move a ... https://docs.mongodb.com Mongodb not null constraint - GLOINNT
For example if you wanted to return all rows where the age is Yes you can create constraint on a field in MongoDB but they are not like SQL databases. http://gloinnt.com Schema Validation — MongoDB Manual
To add document validation to an existing collection, use collMod command with the validator option. MongoDB also provides the following related options:. https://docs.mongodb.com Unique Constraints on Arbitrary Fields — MongoDB Manual
If you create multiple unique indexes on a single proxy collection, you cannot be able to shard proxy collections. © MongoDB, Inc 2008-present. MongoDB, Mongo, ... https://docs.mongodb.com Unique Indexes — MongoDB Manual
You can also enforce a unique constraint on compound indexes. If you use the unique constraint on a compound index, then MongoDB will enforce uniqueness on the combination of the index key values. The... https://docs.mongodb.com |