Comments - Recursive Common Table Expressions Overview

4 years, 11 months ago Mike Reiche
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How to get the depth of the graph?

<code> WITH RECURSIVE graph as ( SELECT pr.*,@depth as depth FROM rcte_people_relationships pr WHERE source_id=3 UNION SELECT pr.*,(@depth:=@depth+1) as depth FROM rcte_people_relationships pr, graph WHERE graph.target_id=pr.source_id ) SELECT * FROM graph CROSS JOIN (SELECT @depth := 0) AS depth; </code>

Creates an infinite loop.

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