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UNIQUE
The UNIQUE function filters duplicate items from a collection. An expression resulting in a collection, never contains duplicate values. A subexpression with the COLLECT statement however, can contain duplicates. See the note on collections and duplicates for more info.
Syntax
UNIQUE ( collection )
Input
- collection - A collection of attribute or entity instances.
Return type
- collection
Examples
Suppose the following model.
| Person instance | Person.name |
|---|---|
| Person_1 | “Kim” |
| Person_2 | “Rick” |
| Person_3 | “Bob” |
| Person_4 | “Rick” |
| Expression | Result | Type | Note |
|---|---|---|---|
| COLLECT Person.name FROM ALL Person | [ "Kim" , "Rick" , "Bob" ] | String (multivalued) | A result never contains duplicate values |
| SIZE ( COLLECT Person.name FROM ALL Person ) | 4 | Integer | A subexpression can contain duplicate values |
| SIZE ( UNIQUE ( COLLECT Person.name FROM ALL Person ) ) | 3 | Integer | The collection holds three unique values |
Overview
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