DELETE the MIN counted data in neo4j - neo4j

Question

I want to delete some data after doing some counting on neo4j. This method can be done manually(counting the data then delete the data), but i need someone to point me whether it's possible or impossible to do this automatically(counting data and delete data in the same query). I couldn't find a way to return the least/minimal data after i did some counting using min() function in neo4j. I can probably do a workaround using order by and limit the data, but i need to be sure that there is no other option than this if i want to do this method.
This is the link to the data. The data is a custom event log that only consists of case_id and activity name.
So this is what i've already tried:
//LOAD DATA
LOAD CSV with headers FROM "file:///*.csv"
AS line
Create (:Activity {CaseId:line.Case_ID,
Name:line.Activity })
LOAD CSV with headers FROM "file:///*.csv"
AS line
Create (:CaseActivity {CaseId:line.Case_ID,
Name:line.Activity })
//SEQUENCE DISCOVERY
match (c:Activity)
with collect(c) AS Caselist
unwind range(0,Size(Caselist) - 2) as idx
with Caselist[idx] AS s1, Caselist[idx+1] AS s2
match (b:CaseActivity),(a:CaseActivity)
where s1.CaseId = s2.CaseId AND
s1.Name = a.Name AND
s2.Name = b.Name AND
s1.CaseId = a.CaseId AND
s2.CaseId = b.CaseId
merge (a)-[:NEXT {relation:"NEXT"}]->(b)
match(a:Activity)
with a.CaseId as id,
collect (a.Name) as Trace_Type
match(b:CaseActivity)
where id = b.CaseId
return count (distinct b.CaseId) as Frequencies, Trace_Type, Collect(distinct b.CaseId) as CaseId
order by Frequencies desc

Answer 1

Your question did not specify what you wanted to delete. This query assumes that you wanted your last query to delete the b nodes (and return some data about the deleted b nodes):
MATCH (a:Activity)
WITH a.CaseId as id, COLLECT(a.Name) AS Trace_Type
MATCH (b:CaseActivity)
WHERE id = b.CaseId
WITH
COUNT(distinct b.CaseId) AS Frequencies,
Trace_Type,
COLLECT(distinct b.CaseId) AS CaseId,
COLLECT(DISTINCT b) AS bs
FOREACH(x IN bs | DELETE x)
RETURN Frequencies, Trace_Type, CaseId
ORDER BY Frequencies DESC;
Variables containing values obtained from deleted b nodes (like Frequencies and CaseId) will still be valid after the nodes are deleted.
A tricky thing to note about your specific example is that your last WITH clause was using aggregation, with Trace_Type as the grouping key. In order for my answer to avoid changing the grouping key (and thereby possibly changing your returned results), I just added COLLECT(DISTINCT b) AS bs to the WITH clause. Then, since each bs is a list of b nodes (for a Trace_Type), I used FOREACH to delete the nodes in each list.