Components  Family of functions  pgRouting Manual (3.0)
Components  Family of functions

pgr_connectedComponents  Connected components of an undirected graph.

pgr_strongComponents  Strongly connected components of a directed graph.

pgr_biconnectedComponents  Biconnected components of an undirected graph.

pgr_articulationPoints  Articulation points of an undirected graph.

pgr_bridges  Bridges of an undirected graph.
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Parameters
Parameter 
Type 
Default 
Description 

Edges SQL 

Inner query as described below. 
Inner query
 Edges SQL

an SQL query which should return a set of rows with the following columns:
Column 
Type 
Default 
Description 

id 

Identifier of the edge. 

source 

Identifier of the first end point vertex of the edge. 

target 

Identifier of the second end point vertex of the edge. 

cost 

Weight of the edge (source, target)


reverse_cost 

1 
Weight of the edge (target, source) ,

Where:
 ANYINTEGER

SMALLINT, INTEGER, BIGINT
 ANYNUMERICAL

SMALLINT, INTEGER, BIGINT, REAL, FLOAT
Result Columns
pgr_connectedComponents & pgr_strongComponents
Returns set of
(seq,
component,
node)
Column 
Type 
Description 

seq 

Sequential value starting from 1 . 
component 

Component identifier. It is equal to the minimum node identifier in the component. 
node 

Identifier of the vertex that belongs to component . 
pgr_biconnectedComponents
Returns set of
(seq,
component,
edge)
Column 
Type 
Description 

seq 

Sequential value starting from 1 . 
component 

Component identifier. It is equal to the minimum edge identifier in the component. 
edge 

Identifier of the edge. 
pgr_articulationPoints
Returns set of
(node)
Column 
Type 
Description 

node 

Identifier of the vertex. 
pgr_bridges
Returns set of
(edge)
Column 
Type 
Description 

edge 

Identifier of the edge that is a bridge. 
See Also
Indices and tables