MongoDB $log10 Operator
MongoDB provides different types of arithmetic expression operators that are used in the aggregation pipeline stages and $log10 operator is one of them. This operator is used to find the log base 10 of the specified number and returns the result as a double.
Syntax:
{ $log10: <number> }
Here, the number is a valid expression until it resolves to a non-negative number.
- If the entered value is null, then this operator will return null.
- If the entered value is NaN, then this operator will return NaN.
- If the entered value is a missing field, then this operator will return null.
Examples:
In the following examples, we are working with:
Database: w3wiki
Collection: example
Document: two documents that contain the details of the shapes in the form of field-value pairs.
Using $log10 operator:
In this example, we are going to find the log base 10 of the value of the side field in the square document.
db.example.aggregate([{$match:{name: "Square"}}, ... {$project: {logbas10: {$log10: "$side"}}}])
Using $log10 operator in the embedded document:
In this example, we are going to find the log base 10 of the value of the measurement.height field in the rectangle document.
db.example.aggregate([{$match:{name: "Rectangle"}}, ... {$project: {logbase10: {$log10: "$measurement.height"}}}])
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