ISONORAFTER DAX Function (Information)

The IsOnOrAfter function is a boolean function that emulates the behavior of Start At clause and returns true for a row that meets all the conditions mentioned as parameters in this function.

Syntax

ISONORAFTER ( <Value1>, <Value2> [, [<Order>] [, <Value1>, <Value2> [, [<Order>] [, … ] ] ] ] )

Parameter	Attributes	Description
Value1	Repeatable	Expression to be compared with second parameter.
Value2	Repeatable	Expression to be compared with first parameter.
Order	Optional Repeatable	The order to be applied. 0/FALSE/DESC – descending; 1/TRUE/ASC – ascending.

Return values

Scalar A single boolean value.

Returns TRUE when the set of values passed as arguments in Value1 is “greater than or equal to” the set of values passed as arguments in Value2.

Remarks

The ISONORAFTER function emulates the behavior of a START AT clause in EVALUATE, and returns TRUE when all of the values passed as argument meet the condition specified.
Usually this function is evaluated in a filter condition during an iteration, applying it to the current row context. However, ISONORAFTER uses the existing evaluation context, so any row context must be created outside of ISONORAFTER, which is not an iterator.

A blank value is matched with BLANK(), in this comparison a blank and an empty string are considered as different values and an empty string is after a blank in ascending order.

» 1 related function

Examples

The following query filters the months greater than or equal to October 2008 by using the ISONORAFTER function in the filter condition of FILTER.

EVALUATE
FILTER (
    SUMMARIZE (
        'Date',
        'Date'[Calendar Year],
        'Date'[Month],
        'Date'[Month Number]
    ),
    ISONORAFTER (
        'Date'[Calendar Year], "CY 2008", ASC,
        'Date'[Month Number], 10, ASC
    )
)
ORDER BY
    'Date'[Calendar Year],
    'Date'[Month Number]

--  ISAFTER and ISONORAFTER are useful functions to compare multiple columns
--  A column is compared only if the previous columns have the same vale
EVALUATE
ADDCOLUMNS (
    SUMMARIZE ( 'Product', 'Product'[Category], 'Product'[Subcategory] ),
    "OnOrAfterCameraAndCamcorders",
        ISONORAFTER (
            'Product'[Category], "Cameras and camcorders", ASC,
            'Product'[Subcategory], "Digital Cameras", ASC
        ),
    "AfterCameraAndCamcorders",
        ISAFTER (
            'Product'[Category], "Cameras and camcorders", ASC,
            'Product'[Subcategory], "Digital Cameras", ASC )
)
ORDER BY
    'Product'[Category],
    'Product'[Subcategory]

Category	Subcategory	OnOrAfterCameraAndCamcorders	AfterCameraAndCamcorders
Audio	Bluetooth Headphones	false	false
Audio	MP4&MP3	false	false
Audio	Recording Pen	false	false
Cameras and camcorders	Camcorders	false	false
Cameras and camcorders	Cameras & Camcorders Accessories	false	false
Cameras and camcorders	Digital Cameras	true	false
Cameras and camcorders	Digital SLR Cameras	true	true
Cell phones	Cell phones Accessories	true	true
Cell phones	Home & Office Phones	true	true
Cell phones	Smart phones & PDAs	true	true
Cell phones	Touch Screen Phones	true	true
Computers	Computers Accessories	true	true
Computers	Desktops	true	true
Computers	Laptops	true	true
Computers	Monitors	true	true
Computers	Printers, Scanners & Fax	true	true
Computers	Projectors & Screens	true	true
Games and Toys	Boxed Games	true	true
Games and Toys	Download Games	true	true
Home Appliances	Air Conditioners	true	true
Home Appliances	Coffee Machines	true	true
Home Appliances	Fans	true	true
Home Appliances	Lamps	true	true
Home Appliances	Microwaves	true	true
Home Appliances	Refrigerators	true	true
Home Appliances	Washers & Dryers	true	true
Home Appliances	Water Heaters	true	true
Music, Movies and Audio Books	Movie DVD	true	true
TV and Video	Car Video	true	true
TV and Video	Home Theater System	true	true
TV and Video	Televisions	true	true
TV and Video	VCD & DVD	true	true