Contents:
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 |
Tip: For additional examples, see Common Tasks.
Examples
Example - Simple unique example
Functions: Source: Code formatting has been applied to improve legibility. 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. Results: For display purposes, the results table has been broken down into three separate sets of columns. Column set 1: Column set 2: Column set 3: 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.
Item ArrayA ArrayB Item1 ["A","B","C"]["1","2","3"]Item2 ["A","B"]["A","B","C"]Item3 ["D","E","F"]["4","5","6"]
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'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"][ ]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 unique2 Item1 ["A","B","C","1","2","3"]Item2 ["A","B","C"]Item3 ["D","E","F","4","5","6"]
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