MongoDBunset

2017年12月13日—MongoDB管道的介绍及操作符实例一介绍管道在Unix和Linux中一般用于将当前命令的输出结果作为下一个命令的参数。MongoDB的聚合管道将MongoDB文档在一个 ...,2011年7月27日—Yes,youhavetouse$unsetoperator,butthisunsetisgoingtoremovethewordskeywhichdoesnotexistforadocumentforacollection.So ...,The$setoperator.The$setoperatorsetsthevalueofaspecifiedfield(s)inadocumentthatmatchesthesearchcriteria...

參考資訊如下
Mongodb字段更新$unset操作符原创

2017年12月13日 — MongoDB 管道的介绍及操作符实例一介绍管道在Unix和Linux中一般用于将当前命令的输出结果作为下一个命令的参数。 MongoDB的聚合管道将MongoDB文档在一个 ...

How to remove a field completely from a MongoDB ...

2011年7月27日 — Yes, you have to use $unset operator, but this unset is going to remove the words key which does not exist for a document for a collection. So ...

How to use $set and $unset operators in MongoDB

The $set operator. The $set operator sets the value of a specified field(s) in a document that matches the search criteria. If the specified field(s) does not ...

$unset — MongoDB Manual

When used with $ to match an array element, $unset replaces the matching element with null rather than removing the matching element from the array. This ...

$unset (aggregation)

Syntax · To remove a single field, the $unset takes a string that specifies the field to remove: $unset: <field> } · To remove multiple fields, the $unset ...

$unset

You can use $unset for deployments hosted in the following environments: MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud.

$unset

The $unset operator deletes a particular field. Compatibility. You can use $unset for deployments hosted in the following environments:.

$unset

You can use $unset for deployments hosted in the following environments: MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud.

How to use MongoDB $unset operator to remove a field from a ...

This tutorial shows you how to use the MongoDB $unset operator to remove one or more fields from a document.