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Examples. For this example, consider a container with multiple items that may contain a quantity field. The SUM function is used to sum the values of the quantity field, when it exists, into a single aggregated value.

Use the $in Operator to Match Values in an Array The following updateMany() operation sets the exclude field to false when the tags array has at least one element that matches either "home" or "school" . For additional examples in querying arrays, see: Query an Array. Query an Array of Embedded Documents.

The SUM function adds values. You can add individual values, cell references or ranges or a mix of all three. For example: =SUM(A2:A10) Adds the values in cells A. =SUM(A2:A10, C2:C10) Adds the values in cells A, as well as cells C2:C10.

1 Answer. In MongoDB, the $sum will add up the value of the expression for every row and in your case, you are having 3 rows so it will be 1+1+1 =3.

SUM returns data type INTEGER for an expression with data type INT, SMALLINT, or TINYINT. SUM returns data type BIGINT for an expression with data type BIGINT. SUM returns data type DOUBLE for an expression with data type DOUBLE. For all other numeric data types, SUM returns data type NUMERIC.

The $sum in MongoDB is used to calculate the sum of numerical values within collections. The $sum in MongoDB can be applied in stages like $group, $project, and $addFields to perform aggregations. The $sum in MongoDB handles missing fields by treating them as 0 and ignoring non-numeric values.

N = count( conn , collection ) returns the total number of documents in a collection by using the MongoDB® C++ interface connection. n = count( conn , collection ,Query= mongoquery ) returns the total number of documents in an executed MongoDB query on a collection.