PATH DAX Function (Parent-child)

Returns a string which contains a delimited list of IDs, starting with the top/root of a hierarchy and ending with the specified ID.

Syntax

PATH ( <ID_ColumnName>, <Parent_ColumnName> )
Parameter Attributes Description
ID_ColumnName

The column containing the IDs for each row.

Parent_ColumnName

The column containing the parent IDs for each row.

Return values

Scalar A single string value.

A delimited text string containing the identifiers of all the parents to the current identifier.

Remarks

This function is used in tables that have some kind of internal hierarchy, to return the items that are related to the current row value. For example, in an Employees table that contains employees, the managers of employees, and the managers of the managers, you can return the path that connects an employee to his or her manager.

The path is not constrained to a single level of parent-child relationships; it can return related rows that are several levels up from the specified starting row.

  • The delimiter used to separate the ascendants is the vertical bar, ‘|’.
  • The values in ID_columnName and parent_columnName must have the same data type, text or integer.
  • Values in parent_columnName must be present in ID_columnName. That is, you cannot look up a parent if there is no value at the child level.
  • If parent_columnName is BLANK then PATH() returns ID_columnName value. In other words, if you look for the manager of an employee but the parent_columnName column has no data, the PATH function returns just the employee ID.
  • If ID_columnName has duplicates and parent_columnName is the same for those duplicates then PATH() returns the common parent_columnName value; however, if parent_columnName value is different for those duplicates then PATH() returns an error. In other words, if you have two listings for the same employee ID and they have the same manager ID, the PATH function returns the ID for that manager. However, if there are two identical employee IDs that have different manager IDs, the PATH function returns an error.
  • If ID_columnName is BLANK then PATH() returns BLANK.
  • If ID_columnName contains a vertical bar ‘|’ then PATH() returns an error.

Related articles

Learn more about PATH in the following articles:

  • Parent-Child Hierarchies

    DAX does not directly support parent-child hierarchies. To obtain a browsable hierarchy in the data model, you have to naturalize a parent-child hierarchy. DAX provides specific functions to naturalize a parent-child hierarchy using calculated columns. The complete pattern also includes measures that improve the visualization of ragged hierarchies in Power Pivot. » Read more

Related functions

Other related functions are:

Last update: Oct 20, 2018   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo

MSDN documentation: https://msdn.microsoft.com/en-us/query-bi/dax/path-function-dax

DAX Conventions
Context Transition

This function performs a Context Transition if called in a Row Context. Click to read more.

Row Context

This expression is executed in a Row Context. Click to read more.

Not recommended

The use of this function is not recommended. See Remarks and Related functions for alternatives.

Not recommended

The use of this parameter is not recommended.

Deprecated

This function is deprecated. Jump to the Alternatives section to see the function to use.

Deprecated

This parameter is deprecated and its use is not recommended.

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