Calculation Functions Reference
This topic contains the descriptions of window functions that can be used to specify measure expressions.
| Function | Description | Example | Image | |
|---|---|---|---|---|
| Last() | Returns the number of rows from the current row to the last row in the window. | Last() |  |
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| First() | Returns the number of rows from the current row to the first row in the window. | First() |  |
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| Index() | Returns the index of the current row in the window. | Index() |  |
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| Size() | Returns the number of rows in the window. | Size() |  |
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| 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) |  |
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| 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])) |  |
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| 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])) |  |
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| RunningMin(SummaryExpression) | Returns the running minimum of the specified expression from the first row in the window to the current row. | RunningMin(Sum([Sales])) |  |
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| RunningSum(SummaryExpression) | Returns the running sum of the specified expression from the first row in the window to the current row. | RunningSum(Sum([Sales])) |  |
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| 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()) |  |
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| WindowCount(SummaryExpression, StartOffset, EndOffset) | Returns the count of the expression within the window. | WindowCount(Sum([Sales]), First()+2, Last()) |  |
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| 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()) |  |
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| WindowMin(SummaryExpression, StartOffset, EndOffset) | Returns the minimum of the expression within the window. | WindowMin(Sum([Sales]), First(), Last()) |  |
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| WindowMedian(SummaryExpression, StartOffset, EndOffset) | Returns the median of the expression within the window. | WindowMedian(Sum([Sales]), First(), Last()) |  |
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| WindowSum(SummaryExpression, StartOffset, EndOffset) | Returns the sum of the expression within the window. | WindowSum(Sum([Sales]), First()+2, Last()) |  |
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| 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 that the Total function calculates the total based on values from the underlying data source. | Total(Sum([Sales])) |  |
[!IMPORTANT] Note that window functions cannot be used inside Aggr.