Add - Remove Column in MongoDB

// add new column and with default value
db.order.update({}, {$set: {"status": 'NEW'}},{multi:true})

//remove a column
db.order.update({}, {$unset: {"status": ''}},{multi:true})

MongoDB - Update statement

//update
db.documentName.update({'_id': ObjectId('566136f3e4b03044bfb8b37e'),'attributeName':'existing-value'},{$set:{'sameAttributeName':'New-value'}})

sample

db.order.update({'_id': ObjectId('566136f3e4b03044bfb8b37e'),'status':'NEW'},{$set:{'status':'COMPLETE'}})







db.login.update({'_id': ObjectId('5667a7ffe4b04ebafe56122e'),'password':'','email':'','mobileNumber':''},{$set:{'password':'qwerty','email':'drvijayy2k2@gmail.com','mobileNumber':'9842088860'}})