Source: https://dev-docs.nebula-graph.io/v5.3.2/database-gql-reference/fe/predicates/all_different/
Documentation version: v5.3.2

# ALL_DIFFERENT predicate

The ALL_DIFFERENT predicate checks if all graph elements in a list are pairwise different from one another.

## Syntax

diagramsource

 all_different_predicate  

````
all_different_predicate ::= 
    ALL_DIFFERENT '(' element_variable_reference (',' element_variable_reference)+ ')'

````

## Parameters

### `element_variable_reference`

The reference to a variable that represents a graph element that is checked for pairwise difference.

## Examples

The following examples are based on the [example dataset](https://dev-docs.nebula-graph.io/v5.3.2/database-gql-reference/overview/example-dataset/).

### Check if all nodes are pairwise different

````
'''
USE movie 
MATCH (v@Director)->(w@Movie), (n@Actor)->(m@Movie), (u@`User`)->(p@Movie) 
WHERE NOT ALL_DIFFERENT(w, m, p) 
RETURN element_id(w)=element_id(m) AS wm, element_id(w)=element_id(p) AS wp, element_id(m)=element_id(p) AS mp
LIMIT 1
'''

````

The preceding statement selects movies directed by directors, movies acted by actors, and movies rated by users, and then checks if these movies are pairwise different.

Return:

````
+-------+-------+------+
| wm    | wp    | mp   |
+-------+-------+------+
| false | false | true |
+-------+-------+------+

````