mongodb exists and not null
db.collection1.find({ 'fieldname1' : { $exists: true, $ne: null } });mongodb exists and not null
db.collection1.find({ 'fieldname1' : { $exists: true, $ne: null } });mongodb query missing field
db.inventory.find( { item: null } )mongodb find all that dont have property
db.things.find( { a : { $exists : false } } ); // return if a is missingCopyright © 2021 Codeinu
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