Chapter 4 / Quiz 2: Logic Operators

Hi there,

I don’t understand why the correct answer in the Quiz is this one :

In the previous lecture “Query Operators - Logic” you tell that we need to specify an explicit “and” operator.

Why the correct answer should’nt be the one with an explicit "and"g)


Hi @Emmanuel_Bernard1, welcome to the community.
Please note that the Quiz asks you to:

Which is the most succinct query to return all documents from …

Where succinct means said clearly or straightforward.

Hence from all the queries mentioned in the options, the correct one is the most succinct (by leveraging the power of implicit $and).

explicit $and can be used here as one of the options but it is straightforward as compared to implicit $and, the lecture was there to provide you an understanding of how you can use explicit $and when needed.

In case you have any doubts, please feel free to reach out to us.

Thanks and Regards.
Sourabh Bagrecha,
Curriculum Services Engineer


In the lecture, it is said “That is the correct airport, but the wrong airplane. This does match my query but it’s not the results that I was looking for. So I need to change my query to get the right results”.

In this example it seems that the “explicit $and” is missing to get the good results.

Why the query in the quiz2 is correct without this explicit $and ?

I think that the explanation is here ?

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