# How do I group fields in MongoDB?

## How do I group fields in MongoDB?

Mongodb group by multiple fields using Aggregate operation First, the key on which the grouping is based is selected and then the collection is divided into groups according to the selected key value. You can then create a final document by aggregating the documents in each group.

## Do group by in MongoDB?

Groups input documents by the specified _id expression and for each distinct grouping, outputs a document. The _id field of each output document contains the unique group by value. The output documents can also contain computed fields that hold the values of some accumulator expression.

## What is MongoDB aggregate?

Aggregation in MongoDB is an operation used to process the data that returns the computed results. Aggregation basically groups the data from multiple documents and operates in many ways on those grouped data in order to return one combined result.

## Is aggregate sum or average?

Aggregate and average are two terms that are often used in calculations. However, these two terms mean two different things. Aggregate refers to the total sum of elements in a data set whereas average refers to the central value in a dataset.

## What is a total average?

Total average is a baseball statistic devised by sportswriter Thomas Boswell and introduced in the 1978. A player’s total average is calculated by summing the accumulated bases and dividing by the number of outs the player makes.

## What does aggregate mean in maths?

The aggregate function simply refers to the calculations performed on a data set to get a single number that accurately represents the underlying data. Some common aggregate functions include: Average (also called arithmetic mean)

## What is matric aggregate?

The aggregate is the sum of – the marks obtained by the candidate, except that where the candidate sat the examination in more than six subjects, the aggregate is the sum of – a.the marks in the best two subjects from Group A of which one must be a First Language and. b.

symbol M

## How many subjects do you need to pass matric?

You need to write 6 subjects and pass at least 5 subjects to qualify for a Senior Certificate. You can register to write exams for at least one of the subjects, and a maximum of six subjects in one year. PLEASE NOTE: Information Technology (IT) is no longer offered as a registered subject in the Western Cape.

## How is matric aggregate calculated?

Steps to Calculate Aggregate for MDCAT

1. Marks obtained in HSSC /Equivalent x 1100 x 0.50 = 50% of HSSC/Equivalent.
2. Marks obtained in Entrance Test / SAT II / MCAT x 1100 x 0.50 = 50% of Admission Test.
3. Aggregate Marks x 100 = Aggregate Percentage.
4. 980 x 1100 x 0.50 = 490.
5. 970 x 1100 x 0.50 = 485.

## How do you calculate aggregate number?

Add together all the numbers in the group. In the example, 45 plus 30 plus 10 equals an aggregate score of 95.

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