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Asked: 2026-05-14T00:03:11+00:00

Suppose I have two columns in a table that represents a graph, the first

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Suppose I have two columns in a table that represents a graph, the first column is a FROMNODE
and second one is TONODE.
What I would like to know is that how will we find all the nodes that are two steps away from a particular node.
Lets suppose I have a node numbered ‘1’ and i would like to know all the nodes that are two steps away from it.

I have tried (I am assuming the table name as graph) 

SELECT FROMNODE FROM GRAPH WHERE TONODE=1

This is to select all the nodes that are connected to node 1, but I couldn’t figure out how would I find all the nodes that are two steps away from node 1?

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1 Answer

  1. Editorial Team

    Take it one step at a time!

    select step2.tonode
from   graph step1
join   graph step2 on step2.fromnode = step1.tonode
where  step1.fromnode = 1
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