Components - Family of functions

Previous versions of this page

  • Supported versions: current(3.0) 2.6
  • Unsupported versions: 2.5

Parameters

Parameter Type Default Description
Edges SQL TEXT   Inner query as described bellow.

Inner query

Edges SQL:an SQL query which should return a set of rows with the following columns:
Column Type Default Description
id ANY-INTEGER   Identifier of the edge.
source ANY-INTEGER   Identifier of the first end point vertex of the edge.
target ANY-INTEGER   Identifier of the second end point vertex of the edge.
cost ANY-NUMERICAL  

Weight of the edge (source, target)

  • When negative: edge (source, target) does not exist, therefore it’s not part of the graph.
reverse_cost ANY-NUMERICAL -1

Weight of the edge (target, source),

  • When negative: edge (target, source) does not exist, therefore it’s not part of the graph.

Where:

ANY-INTEGER:SMALLINT, INTEGER, BIGINT
ANY-NUMERICAL:SMALLINT, INTEGER, BIGINT, REAL, FLOAT

Result Columns

pgr_connectedComponents & pgr_strongComponents

Returns set of (seq, component, node)

Column Type Description
seq INT Sequential value starting from 1.
component BIGINT Component identifier. It is equal to the minimum node identifier in the component.
node BIGINT Identifier of the vertex that belongs to component.

pgr_biconnectedComponents

Returns set of (seq, component, edge)

Column Type Description
seq INT Sequential value starting from 1.
component BIGINT Component identifier. It is equal to the minimum edge identifier in the component.
edge BIGINT Identifier of the edge.

pgr_articulationPoints

Returns set of (node)

Column Type Description
node BIGINT Identifier of the vertex.

pgr_bridges

Returns set of (edge)

Column Type Description
edge BIGINT Identifier of the edge that is a bridge.

See Also

Indices and tables