Query MongoDB with $and and Multiple $or

Question

As stated in the documentation, this is not possible.

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AND Queries With Multiple Expressions Specifying the Same Operator

Consider the following exampl

Answer 1

the documentation doesn't say that this is impossible. It only says

This query cannot be constructed using an implicit AND operation, because it uses the $or operator more than once.

this means that this will work :

db.inventory.find( {
    $and : [
        { $or : [ { price : 0.99 }, { price : 1.99 } ] },
        { $or : [ { sale : true }, { qty : { $lt : 20 } } ] }
    ]
} )

but this won't, because it's an implicit $and with two $or

db.inventory.find({
        { $or : [ { price : 0.99 }, { price : 1.99 } ] },
        { $or : [ { sale : true }, { qty : { $lt : 20 } } ] }
})

try it online: mongoplayground.net/p/gL_0gKzGA-u

Here is a working case with an implicit $and:

db.inventory.find({ price: { $ne: 1.99, $exists: true } })

I guess the problem you're facing is that there is no document matching your request in your collection