Utility Functions

Example Graph

GQL
INSERT (p1:Paper {_id:'P1', title:'Efficient Graph Search', score:6, author:'Alex'}),
       (p2:Paper {_id:'P2', title:'Optimizing Queries', score:9, author:'Alex'}),
       (p3:Paper {_id:'P3', title:'Path Patterns', score:7, author:'Zack'}),
       (p1)-[:Cites {weight:2}]->(p2),
       (p2)-[:Cites {weight:1}]->(p3)

cardinality()

Returns the size of a path, list, or record.

GQL
MATCH p = ()->() LIMIT 1
RETURN cardinality(p)

Result: 3

GQL
LET myList = [1, 2, null, 3]
RETURN cardinality(myList)

Result: 4

GQL
RETURN cardinality({x: 1, y: 3, z: 34})

Result: 3

typeof()

Returns the type name of a value as a string.

GQL
MATCH (n:Paper) LIMIT 1
RETURN typeof(n.author)

Result:

GQL
RETURN typeof(42), typeof("hello"), typeof([1,2,3])

Result:

all_different()

Returns true if all arguments are different graph elements (compared by _id).

GQL
MATCH (a), (b), (c)
WHERE a._id = "P1" AND b._id = "P2" AND c._id = "P3"
RETURN all_different(a, b, c)

Result: true