Q. _______ groups documents by some specified expression and outputs to the next stage a document for each distinct grouping.

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Q. Which of the following is used to retrieve like SELECT clause in SQL?

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Q. ________ limits the number of documents in result set.

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Q. Point out the wrong statement.

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Q. Which of the following provides similar functionality to join?

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Q. Which of the operator is similar to order by clause in RDBMS?

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Q. Point out the wrong statement.

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Q. __________ references the root document, i.e. the top-level document, currently being processed in the aggregation pipeline stage.

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Q. $addToSet returns an array of all _______ values that results from applying an expression to each document.

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Q. 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.

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Q. Which of the following is syntax for calculating minimum value?

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Q. __________ returns the highest value from the group of values in documents.

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Q. Which of the following returns the value that results from applying an expression to the last document?

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Q. When using $first in a $group stage, the $group stage should follow a _______ stage to have the input documents in a defined order.

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Q. Which of the following ignores non numeric values?

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Q. Point out the wrong statement.

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Q. $sum is an accumulator operator available only in the _______ stage.

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Q. __________ take as input a single expression, evaluating the expression once for each input document, and maintain their state for the group of documents.

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Q. ___________ returns either the non-null result of the first expression.

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Q. _______ result encompasses instances of undefined values or missing fields.

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