How do you query for "is not null" in Mongo? - Stack Overflow
Nov 21, 2018 · An alternative that has not been mentioned, but that may be a more efficient option for some (won't work with NULL entries) is to use a sparse index (entries in the index …
MongoDB: How to query for records where field is null or not set?
Apr 6, 2017 · The Query for Null or Missing Fields section of the MongoDB manual describes how to query for null and missing values. Equality Filter The { item : null } query matches …
mongodb - Mongoose query where value is not null - Stack …
1 Ok guys I found a possible solution to this problem. I realized that joins do not exists in Mongo, that's why first you need to query the user's ids with the role you like, and after that do another …
node.js - mongoDB/mongoose: unique if not null - Stack Overflow
Oct 31, 2011 · As of MongoDB v1.8+ you can get the desired behavior of ensuring unique values but allowing multiple docs without the field by setting the sparse option to true when defining …
mongodb - Query where not equal to null or empty - Stack Overflow
Jul 10, 2017 · Query where not equal to null or empty Asked 8 years, 2 months ago Modified 5 years, 3 months ago Viewed 47k times
Storing null vs not storing the key at all in MongoDB
Sep 13, 2012 · 23 Note that, since MongoDB doesnt use field name dictionary compression, field:null consumes disk space and RAM, while storing no key at all doesnt consume resources.
mongodb - Creating a partial index when field is not null - Stack …
Sep 25, 2020 · I am trying to create a partial index on a field, but only when the field is not null. In other words, I want to be able to have many of the documents be able to store null, but for …
MongoDB - Query for "is not null" not working - Stack Overflow
Apr 10, 2022 · MongoDB - Query for "is not null" not working Asked 3 years, 2 months ago Modified 2 years, 8 months ago Viewed 2k times
mongodb - Find documents where value is not null - Stack Overflow
Jun 6, 2014 · The $type operator selects documents where the value is a specific BSON type (10 corresponds to Null). $exists will check that the key exists in the subdocument.
Find MongoDB records where array field is not empty
All of my records have a field called "pictures". This field is an array of strings. I now want the newest 10 records where this array IS NOT empty. I've googled around, but strangely enough …