Neo4j cypher avoid negative values

Question

I have a node that has properties based on another node, For example:

MATCH (n:draft {sn:1}),(m:final {sn:1})
SET m.count = m.count - n.count
RETURN m

Seems to work. However what I want to do is set m.count to 0 if n.count > m.count . n.count > m.count results in a negative value and I want to avoid this.

Answer 1

You should be able to do this:

MATCH (n:draft {sn:1}),(m:final {sn:1})
SET m.count = CASE WHEN n.count > m.count THEN 0 ELSE m.count - n.count END 
RETURN m