pgr_dijkstra return empty result

Question

I want to use pgr_dijkstra in postgresql for OSM data. Steps :

1. Insert OSM data into table 'streets' that contains source and target columns.
2. Create streets_noded table with pgr_nodenetwork function.
3. Use streets table in pgr_dijkstra.

Why the result is null ? What's wrong?

Answer 1

Finally I followed the steps of this link and It's worked!