MongoDB Questions and Answers – Pipeline Operators – 2

This set of MongoDB Questions for entrance exams focuses on “Pipeline Operators – 2”.

1. $sum is an accumulator operator available only in the _______ stage.
a) $group
b) $sets
c) $accumulator
d) None of the mentioned
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2. Point out the wrong statement.
a) $avg is an accumulator operator available only in the $group stage
b) $sum accumulator can be used to compute the total amount and count for each group of documents
c) $avg ignores numeric values
d) All of the mentioned
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3. Which of the following ignores non numeric values?
a) $order
b) $sum
c) $asc
d) None of the mentioned
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4. When using $first in a $group stage, the $group stage should follow a _______ stage to have the input documents in a defined order.
a) $order
b) $sort
c) $asc
d) None of the mentioned
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5. Which of the following returns the value that results from applying an expression to the last document?
a) $end
b) $last
c) $max
d) All of the mentioned
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6. __________ returns the highest value from the group of values in documents.
a) $end
b) $last
c) $max
d) $maximum
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7. Which of the following is syntax for calculating minimum value?
a) { $minimum: <int> }
b) { $min: <expression>}
c) { $minimum: <expression> }
d) None of the mentioned
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8. If all documents for the $min operation have null value for the field or are missing the field, the $min operator returns ____ for the minimum value.
a) 1
b) 0
c) null
d) none of the mentioned
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9. $addToSet returns an array of all _______ values that results from applying an expression to each document.
a) unique
b) non unique
c) distinct
d) all of the mentioned
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