mongodb set type
For the aggregation stage $set , available starting in MongoDB 4.2, see $set . The $set operator replaces the value of a field with the specified value. To specify a <field> in an embedded document or in an array, use dot notation. ,Unlike the $type query operator, which matches array elements based on their BSON type, the $type aggregation operator does not examine array elements.
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 mongodb set type 相關參考資料
$convert (aggregation) — MongoDB Manual
type conversion, convert to long, convert to int, convert to integer, convert to ObjectId, aggregation, convert to decimal, convert to double, convert to string, ... https://docs.mongodb.com $set — MongoDB Manual - MongoDB Documentation
For the aggregation stage $set , available starting in MongoDB 4.2, see $set . The $set operator replaces the value of a field with the specified value. To specify a <field> in an embedded docum... https://docs.mongodb.com $type (aggregation) — MongoDB Manual
Unlike the $type query operator, which matches array elements based on their BSON type, the $type aggregation operator does not examine array elements. https://docs.mongodb.com $type — MongoDB Manual
$type selects documents where the value of the field is an instance of the specified ... The types specified in the array can be either numeric or string aliases. https://docs.mongodb.com BSON Types — MongoDB Manual
BSON is a binary serialization format used to store documents and make remote procedure calls in MongoDB. The BSON specification is located at ... https://docs.mongodb.com Data Types in the mongo Shell — MongoDB Manual
MongoDB BSON provides support for additional data types than JSON. Drivers provide native support for these data types in host languages and the mongo ... https://docs.mongodb.com Databases and Collections — MongoDB Manual
MongoDB Logo ...... in a single collection do not need to have the same set of fields and the data type for a field can differ across documents within a collection. https://docs.mongodb.com Documents — MongoDB Manual
The above fields have the following data types: _id holds an ObjectId. name holds an embedded document that contains the fields first and last . birth and death ... https://docs.mongodb.com How to change the type of a field in MongoDB? - Tutorialspoint
Let us convert string type to int for an example. Aggregation does not allow us to directly change the type of a field; therefore, you need to write ... https://www.tutorialspoint.com How to change the type of a field? - Stack Overflow
The only way to change the $type of the data is to perform an update on the ..... $set is a new aggregation operator ( Mongo 4.2 ) which in this case modifies a ... https://stackoverflow.com |