Page tree

Release 8.7.1


Our documentation site is moving!

For up-to-date documentation of release 8.7 of Self Managed Designer Cloud, please visit us at



Extracts the set of unique values from a column into an array stored in a new column. This function is typically part of an aggregation. 

NOTE: Output order of nested values from an aggregation function cannot be determined in advance. The work to generate output values is done in parallel, which results in different ordering of any nested values for each execution run for each running environment. 

Tip: To generate unique values for the generated array, apply the ARRAYUNIQUE function in the next step after this one. See ARRAYUNIQUE Function.

Input column can be of any type.

  • By default, the list is limited to 1000 values. To change the maximum number of values, specify a value for the limit parameter.
  • This function is intended to be used as part of an aggregation to return the unique set of values by group. See Pivot Transform.

For a version of this function computed over a rolling window of rows, see ROLLINGLIST Function.

Wrangle vs. SQL: This function is part of Wrangle, a proprietary data transformation language. Wrangle is not SQL. For more information, see Wrangle Language.

Basic Usage

unique(Name, 500)

Output: Returns the unique values for Name in an array of all values (up to a count of 500).

Syntax and Arguments

unique(function_col_ref, [limit_int]) [ group:group_col_ref] [limit:limit_count]

ArgumentRequired?Data TypeDescription
function_col_refYstringName of column to which to apply the function
limit_intNinteger (positive)Maximum number of unique values to extract into the list array. From 1 to 1000.

For more information on the group and limit parameters, see Pivot Transform.

For more information on syntax standards, see Language Documentation Syntax Notes.


Name of the column from which to extract the list of unique values based on the grouping.

  • Literal values are not supported as inputs.
  • Multiple columns and wildcards are not supported.

Usage Notes:

Required?Data TypeExample Value
YesString (column reference)myValues


Non-negative integer that defines the maximum number of unique values to extract into the list array. 

NOTE: If specified, this value must between 1 and 1000, inclusive.

NOTE: Do not use the limiting argument in a unique function call on a flat aggregate, in which all values in a column have been inserted into a single cell. In this case, you might be able to use the limit argument if you also specify a group parameter. Misuse of the unique function can cause the application to crash.

Usage Notes:

Required?Data TypeExample Value


Tip: For additional examples, see Common Tasks.

Example - Colors sold this month

This example illustrates the following functions:
  • LIST - Extracts up to 1000 values from one column into an array in a new column. See LIST Function.
  • UNIQUE - Extracts up to 1000 unique values from one column into an array in a new column. See UNIQUE Function.

You have the following set of orders for two months, and you are interested in identifying the set of colors that have been sold for each product for each month and the total quantity of product sold for each month. 




To track by month, you need a column containing the month value extracted from the date:

Transformation Name Edit column with formula
Parameter: Columns Date
Parameter: Formula DATEFORMAT(Date, 'MMM yyyy')

You can use the following transform to check the list of unique values among the colors:

Transformation Name Pivot columns
Parameter: Row labels Date
Parameter: Values unique(Color, 1000)
Parameter: Max number of columns to create 10

Jan 2015["green","blue","red","yellow"]
Apr 2015

Delete the above transform.

You can aggregate the data in your dataset, grouped by the reformatted Date values, and apply the LIST function to the Color column. In the same aggregation, you can include a summation function for the Qty column:

Transformation Name Pivot columns
Parameter: Row labels Date
Parameter: Values list(Color, 1000),sum(Qty)
Parameter: Max number of columns to create 10


Jan 2015["green","blue","blue","red","green","red","yellow"]28
Apr 2015

This page has no comments.