Function count() calculates the number of rows of an alias. Only one row from the alias will be kept after this function is called, and all the rest rows will be abandoned.

Arguments：

• Any Value <any>

Returns：

• Number of Rows <number>

ATTR

Example: deduplicate the elements in an array, count the number of the elements after deduplication

uncollect [1,2,4,5,2,1,3] as a
with distinct(a) as b
return count(b)

Node

Example: find @device nodes, count the number of them

find().nodes({@device}) as n
return count(n)

Edge

Example: find @view edges, count the number of it

find().edges({@view}) as e
return count(e)

Path

Example: find the shortest paths from Card CA001 to CA002 within 5 steps, count the number of the paths

n({_id == "CA001"}).e()[*:5].n({_id == "CA002"}) as p
return count(p)