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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

Dica

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"]]

Column set 3:

Item

unique2

Item1

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

Item2

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

Item3

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