Question : mongodb exists and not null
Answered by : yogesh-agarwal
db.collection1.find({ 'fieldname1' : { $exists: true, $ne: null } });Source : | Last Update : Sat, 11 Jul 20
Question : mongodb exists
Answered by : difficult-dragonfly-sw25xz6t7yif
db.records.find( { a: { $exists: true } } )Source : | Last Update : Fri, 16 Oct 20
Question : exists in mongodb
Answered by : rasel-ahmed-9kilyai1mdfd
-- Syntax: { field: { $exists: <boolean> } }
-- Example:
db.inventory.find( { qty: { $exists: true, $nin: [ 5, 15 ] } } )
db.records.find( { a: { $exists: true } } )Source : https://www.mongodb.com/docs/manual/reference/operator/query/exists/ | Last Update : Sat, 25 Jun 22