MQL reference navigation
MongoDB Query Language (MQL) Window Operators Operators
Window operators perform calculations across a set of documents in a specified window.
$covariancePop
The $covariancePop operator returns the covariance of two numerical expressions
$covarianceSamp
The $covarianceSamp operator returns the covariance of a sample of two numerical expressions
$denseRank
The $denseRank operator assigns and returns a positional ranking for each document within a partition based on a specified sort order
$derivative
The $derivative operator calculates the average rate of change of the value of a field within a specified window.
$documentNumber
The $documentNumber operator assigns and returns a position for each document within a partition based on a specified sort order
$expMovingAvg
The $expMovingAvg operator calculates the moving average of a field based on the specified number of documents to hold the highest weight
$integral
The $integral operator calculates the area under a curve with the specified range of documents forming the adjacent documents for the calculation.
$linearFill
The $linearFill operator interpolates missing values in a sequence of documents using linear interpolation.
$locf
The $locf operator propagates the last observed non-null value forward within a partition in a windowed query.
$rank
The $rank operator ranks documents within a partition based on a specified sort order.
$shift usage on DocumentDB
A window operator that shifts values within a partition and returns the shifted value.