CROSSJOIN - Daxplained

CROSSJOIN is a DAX function that returns a table that is a crossjoin of the specified tables.

Syntax

CROSSJOIN( [ Table, ... ] )

Argument	Properties	Description
Table	Repeatable	A table that will participate in the crossjoin.

A table that contains the Cartesian product of all rows from all tables in the arguments.

Column names from table arguments must all be different in all tables or an error is returned.
The total number of rows returned by CROSSJOIN() is equal to the product of the number of rows from all tables in the arguments; also, the total number of columns in the result table is the sum of the number of columns in all tables. For example, if TableA has rA rows and cA columns, and TableB has rB rows and cB columns, and TableC has rC rows and cC column; then, the resulting table has rA × rb × rC rows and cA + cB + cC columns.
This function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.

The following example shows the results of applying CROSSJOIN() to two tables: Colors and Stationery.

The table Colors contains colors and patterns:

The table Stationery contains fonts and presentation:

Font	Presentation
serif	embossed
sans-serif	engraved

The expression to generate the cross join is presented below:

CROSSJOIN( Colors, Stationery)

When the above expression is used wherever a table expression is expected, the results of the expression would be as follows:

Color	Pattern	Font	Presentation
Red	Horizontal Stripe	serif	embossed
Green	Vertical Stripe	serif	embossed
Blue	Crosshatch	serif	embossed
Red	Horizontal Stripe	sans-serif	engraved
Green	Vertical Stripe	sans-serif	engraved
Blue	Crosshatch	sans-serif	engraved

Other functions related to CROSSJOIN are:

Contribute » | Contributors: Rick de Groot
Microsoft documentation: https://learn.microsoft.com/en-us/dax/crossjoin-function-dax