Source: https://dev-docs.nebula-graph.io/v5.3.2/database-gql-reference/data-types/set-type/
Documentation version: v5.3.2

# Set types

A set is a constructed data type used to store an unordered collection of unique elements. Unlike lists, elements in a set are not indexed and are automatically deduplicated.

Sets are enclosed in curly braces (`{}`) with elements separated by commas (`,`). Whitespace surrounding the elements is ignored, allowing the use of newlines, tabs, and spaces for formatting purposes.

The set type must be declared using the `SET<E>` keyword, where `E` represents the data type of the elements. Elements can be any predefined data type or constructed data type other than records and paths.

## Declaration example

````
'''
CREATE GRAPH TYPE IF NOT EXISTS set_type AS  
    { NODE Person 
        ( { 
            name STRING PRIMARY KEY,  
            email_list SET<STRING> DEFAULT SET{"eee@fff.com", "ggg@hhh.org"}
        } ) 
    }
'''

````

## Supported operators

The set type supports the following operators:

 | Operator | Name | Description | Example | Result
 | `||` | Union | Merges two sets into a new set. Duplicate elements are automatically removed. | `RETURN SET{1, 2} || SET{2, 3}` | `{1, 2, 3}`
 | `IN` | Inclusion | Checks if a specific element exists within the set. | `RETURN 1 IN SET{1, 2, 3}` | `true`
 | `NOT IN` | Exclusion | Checks if a specific element does not exist within the set. | `RETURN 4 NOT IN SET{1, 2, 3}` | `true`

## More information

- [Set literals](https://dev-docs.nebula-graph.io/v5.3.2/database-gql-reference/fe/literals/#set_literals)