Javascript

collection.find({ arrayElementName: { $exists: true, $not: {$size: 0} } })

db.collection.find({arrayElementName : {$exists:true, $size:0}})

db.collection.update({}, { $set : {'myArray': [] }} , {multi:true} )


//mongobd database name should be use in Like
"E-Shop" or "E_Shop"
//must use underscore or -

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