mongodb query array value
Returns the element at the specified array index. $arrayElemAt has the ... If the idx exceeds the array bounds, $arrayElemAt does not return any result. For more ... ,The $elemMatch operator limits the contents of an <array> field from the query results to contain only the first element matching the $elemMatch condition. ,The $elemMatch operator matches documents that contain an array field with at least one element that matches all the specified query criteria. copy. copied. ,$all, Matches arrays that contain all elements specified in the query. $elemMatch, Selects documents if element in the array field matches all the specified ... ,But I'd also recommend making the string array explicit in your schema: .... This query is taken from this post: MongoDb query array with null values. It was a ... ,The $in operator selects the documents where the value of a field equals any value in the specified array. To specify an $in expression, use the following ... ,As you've designed the data this is not possible. In MongoDB, queries return an entire document. You can filter specific fields, but if the value of a field is an array ... ,[edit based on this now being possible in recent versions]. [Updated Answer] You can query the following way to get back the name of class and the student id ... ,MongoDB Manual - how to query an array of documents, how to query an array of ... document that contains the field qty whose value is less than or equal to 20 :. ,To query if the array field contains at least one element with the specified value, use the filter <field>: <value> } where <value> is the element value. To query if the array field contains at least one element with the specified value
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 mongodb query array value 相關參考資料
$arrayElemAt (aggregation) — MongoDB Manual
Returns the element at the specified array index. $arrayElemAt has the ... If the idx exceeds the array bounds, $arrayElemAt does not return any result. For more ... https://docs.mongodb.com $elemMatch (projection) — MongoDB Manual
The $elemMatch operator limits the contents of an <array> field from the query results to contain only the first element matching the $elemMatch condition. https://docs.mongodb.com $elemMatch (query) — MongoDB Manual
The $elemMatch operator matches documents that contain an array field with at least one element that matches all the specified query criteria. copy. copied. https://docs.mongodb.com Array Query Operators — MongoDB Manual
$all, Matches arrays that contain all elements specified in the query. $elemMatch, Selects documents if element in the array field matches all the specified ... https://docs.mongodb.com Find document with array that contains a specific value - Stack ...
But I'd also recommend making the string array explicit in your schema: .... This query is taken from this post: MongoDb query array with null values. It was a ... https://stackoverflow.com MongoDB Query operator - MongoDB Documentation
The $in operator selects the documents where the value of a field equals any value in the specified array. To specify an $in expression, use the following ... https://docs.mongodb.com MongoDB query to retrieve one array value by a value in the array ...
As you've designed the data this is not possible. In MongoDB, queries return an entire document. You can filter specific fields, but if the value of a field is an array ... https://stackoverflow.com MongoDB: How to find out if an array field contains an element ...
[edit based on this now being possible in recent versions]. [Updated Answer] You can query the following way to get back the name of class and the student id ... https://stackoverflow.com Query an Array of Embedded Documents — MongoDB Manual
MongoDB Manual - how to query an array of documents, how to query an array of ... document that contains the field qty whose value is less than or equal to 20 :. https://docs.mongodb.com Query an Array — MongoDB Manual
To query if the array field contains at least one element with the specified value, use the filter <field>: <value> } where <value> is the element value. To query if the array field... https://docs.mongodb.com |