Returns a parallel period of dates by the given set of dates and a specified interval.
The name of a column containing dates or a one column table containing dates.
The number of the intervals.
A table containing a single column of date values.
In order to use any time intelligence calculation, you need a well-formed date table. The Date table must satisfy the following requirements:
- All dates need to be present for the years required. The Date table must always start on January 1 and end on December 31, including all the days in this range. If the report only references fiscal years, then the date table must include all the dates from the first to the last day of a fiscal year. For example, if the fiscal year 2008 starts on July 1, 2007, then the Date table must include all the days from July 1, 2007 to June 30, 2008.
- There needs to be a column with a DateTime or Date data type containing unique values. This column is usually called Date. Even though the Date column is often used to define relationships with other tables, this is not required. Still, the Date column must contain unique values and should be referenced by the Mark as Date Table feature. In case the column also contains a time part, no time should be used – for example, the time should always be 12:00 am.
- The Date table must be marked as a date table in the model, in case the relationship between the Date table and any other table is not based on the Date.
The dates argument can be any of the following:
- A reference to a date/time column. Only in this case a context transition applies because the <Dates> column reference is replaced by
- A table expression that returns a single column of date/time values.
- A Boolean expression that defines a single-column table of date/time values.
This function takes the current set of dates in the column specified by Dates, shifts the first date and the last date the specified number of intervals, and then returns all contiguous dates between the two shifted dates. If the interval is a partial range of month, quarter, or year then any partial months in the result are also filled out to complete the entire interval.
The result table includes only dates that exist in the dates column.
-- PARALLELPERIOD returns a full period shifted in time EVALUATE CALCULATETABLE ( PARALLELPERIOD ( 'Date'[Date], -1, YEAR ), 'Date'[Date] = DATE ( 2008, 08, 15 ) )
-- A common usage of PARALLELPERIOD is to use zero for the offset, -- in that case PARALLELPERIOD extends the selection to the period EVALUATE CALCULATETABLE ( PARALLELPERIOD ( 'Date'[Date], 0, MONTH ), 'Date'[Date] = DATE ( 2008, 08, 15 ) )
-- -- When used with a period PARALLELPERIOD: -- Computes the min and max dates in the selection -- Extends min and max to the entire period defined -- Shifts the result according to the offset -- -- In the example: -- Starting period: 2008-08-15, 2008-09-20 -- Extended period: 2008-08-01 : 2008-09-30 -- Shifted period: 2008-09-01 : 2008-10-31 EVALUATE CALCULATETABLE ( PARALLELPERIOD ( 'Date'[Date], +1, MONTH ), OR ( 'Date'[Date] = DATE ( 2008, 08, 15 ), 'Date'[Date] = DATE ( 2008, 09, 20 ) ) )
-- Report showing the result of sales in the current month, -- current quarter and previous quarter DEFINE MEASURE Sales[Sales Current Quarter] = CALCULATE ( [Sales Amount], PARALLELPERIOD ( 'Date'[Date], 0, QUARTER ) ) MEASURE Sales[Sales Prev Quarter] = CALCULATE ( [Sales Amount], PARALLELPERIOD ( 'Date'[Date], -1, QUARTER ) ) EVALUATE CALCULATETABLE ( ADDCOLUMNS ( SUMMARIZE ( Sales, 'Date'[Calendar Year], 'Date'[Month], 'Date'[Month Number] ), "Current Sales", [Sales Amount], "Sales Current Quarter", [Sales Current Quarter], "Sales Prev Quarter", [Sales Prev Quarter] ), 'Date'[Calendar Year] = "CY 2007", 'Date'[Month Number] <= 9 ) ORDER BY [Calendar Year], [Month Number]
|Calendar Year||Month||Month Number||Current Sales||Sales Current Quarter||Sales Prev Quarter|
Other related functions are:
Contributors: Alberto Ferrari, Marco Russo
Microsoft documentation: https://docs.microsoft.com/en-us/dax/parallelperiod-function-dax