[postgis-users] How can I split a polyline?

[Fay Du]

Hi All:
   How can I split a polyline in PostGIS? Or how can I read all point in
a polyline and split by my self? I want to use pgdijkstra module, and it
dos not allow tow polyline share end point, I want to split one and add
one more end node in the table. 
   Many, many thanks for any help.
Fay
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