Question 11 : $addToSet returns an array of all _______ values that results from applying an expression to each document.
1. unique
2. non unique
3. distinct
4. all of the mentioned
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Question 12 : 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.
1. 1
2. 0
3. null
4. none of the mentioned
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Question 13 : Which of the following is syntax for calculating minimum value ?
1. { $minimum: <int> }
2. { $min: <expression>}
3. { $minimum: <expression> }
4. None of the mentioned
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Question 14 : __________ returns the highest value from the group of values in documents.
1. $end
2. $last
3. $max
4. $maximum
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Question 15 : Which of the following returns the value that results from applying an expression to the last document ?
1. $end
2. $last
3. $max
4. All of the mentioned
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Question 16 : When using $first in a $group stage, the $group stage should follow a _______ stage to have the input documents in a defined order.
1. $order
2. $sort
3. $asc
4. None of the mentioned
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Question 17 : Which of the following ignores non numeric values ?
1. $order
2. $sum
3. $asc
4. None of the mentioned
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Question 18 : $sum is an accumulator operator available only in the _______ stage
1. $group
2. $sets
3. $accumulator
4. None of the mentioned
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Question 19 : __________ take as input a single expression, evaluating the expression once for each input document, and maintain their state for the group of documents.
1. Computer
2. Monitors
3. Accumulators
4. Performoner
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Question 20 : ___________ returns either the non-null result of the first expression.
1. $Null
2. $ifNull
3. $ElseNull
4. None of the mentioned
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