ARRAYUNIQUE Function

Generates an array of all unique elements among one or more arrays.

Inputs are column names or array literals.
If an element appears twice in one or more arrays, it is listed once in the output array.

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

Array literal reference example:

arrayunique([["A","B"],["A","C"]])

Output: Returns a single array:

["A","B","C"]

Single-column reference example:

arrayunique([array1])

Output: Returns a single array of all unique elements in array1.

Multi-column reference example:

arrayunique([array1,array2])

Output: Returns a single array listing all unique elements in array1 and array2.

Syntax and Arguments

arrayunique(array_ref1,array_ref2)

Argument	Required?	Data Type	Description
array_ref1	Y	string or array	Name of first column or first array literal to apply to the function
array_ref2	N	string or array	Name of second column or second array literal to apply to the function

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

array_ref1, array_ref2

Array literals or names of the array columns whose unique elements you want to derive.

Usage Notes:

Required?	Data Type	Example Value
Yes (at least one)	Array literal or column reference	`myArray1`, `myArray2`

Examples

Tip

For additional examples, see Common Tasks.

Example - Simple unique example

This example illustrates how to use the nested functions.

Functions:

Item	Description
ARRAYCONCAT Function	Combines the elements of one array with another, listing all elements of the first array before listing all elements of the second array.
ARRAYINTERSECT Function	Generates an array containing all elements that appear in multiple input arrays, referenced as column names or array literals.
ARRAYCROSS Function	Generates a nested array containing the cross-product of all elements in two or more arrays.
ARRAYUNIQUE Function	Generates an array of all unique elements among one or more arrays.

Source:

Code formatting has been applied to improve legibility.

Item	ArrayA	ArrayB
Item1	["A","B","C"]	["1","2","3"]
Item2	["A","B"]	["A","B","C"]
Item3	["D","E","F"]	["4","5","6"]

Transformation:

You can apply the following transforms in the following order. Note that the column names must be different from the transform name, which is a reserved word.

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	ARRAYCONCAT([Letters,Numerals])
Parameter: New column name	'concat2'

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	ARRAYINTERSECT([Letters,Numerals])
Parameter: New column name	'intersection2'

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	ARRAYCROSS([Letters,Numerals])
Parameter: New column name	'cross2'

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	ARRAYUNIQUE([Letters,Numerals])
Parameter: New column name	'unique2'

Results:

For display purposes, the results table has been broken down into three separate sets of columns.

Column set 1:

Item	ArrayA	ArrayB	concat2	intersection2
Item1	`["A","B","C"]`	["1","2","3"]	["A","B","C","1","2","3"]	`[ ]`
Item2	["A","B"]	["A","B","C"]	["A","B","A","B","C"]	["A","B"]
Item3	["D","E","F"]	["4","5","6"]	["D","E","F","4","5","6"]	[ ]

Column set 2:

Item	cross2
Item1	[["A","1"],["A","2"],["A","3"],["B","1"],["B","2"],["B","3"],["C","1"],["C","2"],["C","3"]]
Item2	[["A","A"],["A","B"],["A","C"],["B","A"],["B","B"],["B","C"]]
Item3	[["D","4"],["D","5"],["D","6"],["E","4"],["E","5"],["E","6"], ["F","4"],["F","5"],["F","6"]]

Item

cross2

Item1

[["A","1"],["A","2"],["A","3"],["B","1"],["B","2"],["B","3"],["C","1"],["C","2"],["C","3"]]

Item2

[["A","A"],["A","B"],["A","C"],["B","A"],["B","B"],["B","C"]]

Item3

[["D","4"],["D","5"],["D","6"],["E","4"],["E","5"],["E","6"], ["F","4"],["F","5"],["F","6"]]

Column set 3:

Item	unique2
Item1	["A","B","C","1","2","3"]
Item2	["A","B","C"]
Item3	["D","E","F","4","5","6"]

In this section: