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v4.0
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    中文EN
    v4.0

      count() | Count

      Parameters, Value

      Count operation can count the number of nodes, edges, paths, property values or schemas, as long as it is a column of elmements, the quantity can be counted by count().

      Syntax:

      • Format: count(<column>)
      • Parameters: see table below
      • Value: ATTR (numbers)
      Name Category Specification Description
      <column> NODE,EDGE,PATH,ATTR,ARRAY,TABLE / The column to be aggregated

      The value of <column> with different categories in every row:

      Type Value
      NODE Node's UUID in the row
      EDGE Edge's UUID in the row
      PATH ROW INDEX(starts from 0)in the row
      ATTR ATTR's value in the row
      ARRAY The value of the 1st element in the array of the row
      TABLE ROW INDEX(starts from 0)in the row

      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)
      
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