MongoDB

.find()
 - image: {$exists: true}
 - {image: /^asd/i}
 
.find({
    image: {$exists: true},
    "zones.6b": 12,
    $or: [{"zone.7b": 12}, {"zone8a": 11}]
})
 
$group
    $sum
    $avg
    $max
    $min