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Window Calculation Functions

  • 3 min to read

This topic contains a description of window functions that can be used to specify measure expressions.

Function

Description

Example

Last()

Returns the number of rows from the current row to the last row in the window.

Last()

CalculationFunction_Last

First()

Returns the number of rows from the current row to the first row in the window.

First()

CalculationFunction_First

Index()

Returns the index of the current row in the window.

Index()

CalculationFunction_Index

Size()

Returns the number of rows in the window.

Size()

CalculationFunction_Size

Lookup(SummaryExpression, Position)

Returns the value of the expression in a target position specified as a relative offset from the current position.

Lookup(Sum([Sales]), 3)

CalculationFunction_Lookup

RankCompetition(SummaryExpression, [ 'asc' | 'desc' ])

Returns the standard competition rank for the current row in the window.

RankCompetition(Sum([Sales]), 'asc')

RankDense(SummaryExpression, [ 'asc' | 'desc' ])

Returns the dense rank for the current row in the window.

RankDense(Sum([Sales]), 'asc')

RankUnique(SummaryExpression, [ 'asc' | 'desc' ])

Returns the unique rank for the current row in the window.

RankUnique(Sum([Sales]), 'asc')

RankModified(SummaryExpression, [ 'asc' | 'desc' ])

Returns the modified competition rank for the current row in the window.

RankModified(Sum([Sales]), 'asc')

RankPercentile(SummaryExpression, [ 'asc' | 'desc' ])

Returns the percentile rank for the current row in the window.

RankPercentile(Sum([Sales]), 'desc')

RunningAvg(SummaryExpression)

Returns the running average of the specified expression from the first row in the window to the current row.

RunningAvg(Sum([Sales]))

CalculationFunction_RunningAvg

RunningCount(SummaryExpression)

Returns the running count of the specified expression from the first row in the window to the current row.

RunningCount(Sum([Sales]))

RunningMax(SummaryExpression)

Returns the running maximum of the specified expression from the first row in the window to the current row.

RunningMax(Sum([Sales]))

CalculationFunction_RunningMax

RunningMin(SummaryExpression)

Returns the running minimum of the specified expression from the first row in the window to the current row.

RunningMin(Sum([Sales]))

CalculationFunction_RunningMin

RunningSum(SummaryExpression)

Returns the running sum of the specified expression from the first row in the window to the current row.

RunningSum(Sum([Sales]))

CalculationFunction_RunningSum

WindowAvg(SummaryExpression, StartOffset, EndOffset)

Returns the average of the expression within the window, which is defined using offsets from the current row.

WindowAvg(Sum([Sales]), First(), Last())

CalculationFunction_WindowAvg

WindowCount(SummaryExpression, StartOffset, EndOffset)

Returns the count of the expression within the window.

WindowCount(Sum([Sales]), First()+2, Last())

CalculationFunction_WindowCount_plus2

WindowCountDistinct(SummaryExpression, StartOffset, EndOffset)

Returns the distinct count of the expression within the window.

WindowCountDistinct(Sum([Sales]), First(), Last())

WindowMax(SummaryExpression, StartOffset, EndOffset)

Returns the maximum of the expression within the window.

WindowMax(Sum([Sales]), First(), Last())

CalculationFunction_WindowMax

WindowMin(SummaryExpression, StartOffset, EndOffset)

Returns the minimum of the expression within the window.

WindowMin(Sum([Sales]), First(), Last())

CalculationFunction_WindowMin

WindowMode(SummaryExpression, StartOffset, EndOffset)

Returns the statistical mode in the window (the element that occurs most often in the values calculated with the specified expression within the window).

WindowMode(Sum([Sales]), First(), Last())

WindowMedian(SummaryExpression, StartOffset, EndOffset)

Returns the median of the expression within the window.

WindowMedian(Sum([Sales]), First(), Last())

CalculationFunction_WindowMedian

WindowSum(SummaryExpression, StartOffset, EndOffset)

Returns the sum of the expression within the window.

WindowSum(Sum([Sales]), First()+2, Last())

CalculationFunction_WindowSum-plus2

WindowVar(SummaryExpression, StartOffset, EndOffset)

Returns the variance of the expression within the window.

WindowVar(Sum([Sales]), First(), Last())

WindowVarp(SummaryExpression, StartOffset, EndOffset)

Returns the biased variance of the expression within the window.

WindowVarp(Sum([Sales]), First(), Last())

WindowStdDev(SummaryExpression, StartOffset, EndOffset)

Returns the sample standard deviation of the expression within the window.

WindowStdDev(Sum([Sales]), First(), Last())

WindowStdDevp(SummaryExpression, StartOffset, EndOffset)

Returns the biased standard deviation of the expression within the window.

WindowStdDevp(Sum([Sales]), First(), Last())

Total(SummaryExpression)

Returns the total for the specified expression in a calculation window.

Note

Note that the Total function calculates the total based on values from the underlying data source.

Total(Sum([Sales]))

CalculationFunction_Total

Important

Note that window functions cannot be used inside Aggr.