Problem with Interactive Report

Question

Hi,
I am trying to create a report using five tables named 1.Servers:- server_id,name,service_id,type_id 2.Servertype:-type_id,name 3.CPUutilzation:-cpuutil_id,server_id,parameter_id,average,maximum,timestamp 4.MEMutilzation:-memutil_id,server_id,parameter_id,average,maximum,timestamp 5.Serverparameter:-parameter_id,name
i am using the below query:-
select s.caption as "Server Name",st.caption as "Server Type",cp.maximum as "MAX CPU Utilization",cp.average as "Avg CPU Utilization",mp.average as "Avg Memory Utilization",mp.maximum as "MAX Memory Utilization"
from servers s,servertype st,cpuutil cp,memutil mp
where s.type_id=st.type_id
and cp.server_id=s.server_id
and mp.server_id=s.server_id
The problem is that I have 24 records in cpu utilization and memory utilization tables. However the report is displaying 48 records.
I would really appreciate if someone could help me to rectify the problem.
Regards,
Ash

Answer 1

Hi Ash
First off, when posting code on the forum please put {noformat}{noformat} (with the curly brackets and the word code in lower case) before and after you code. This will preserve formatting so that the rest of us can read it, like this...SELECT s.caption AS "Server Name",
st.caption AS "Server Type",
cp.maximum AS "MAX CPU Utilization",
cp.average AS "Avg CPU Utilization",
mp.average AS "Avg Memory Utilization",
mp.maximum AS "MAX Memory Utilization"
FROM servers s,
servertype st,
cpuutil cp,
memutil mp
WHERE s.type_id = st.type_id
AND cp.server_id = s.server_id
AND mp.server_id = s.server_id
Basically your getting duplicate rows because one of your joins is returning two rows that match the condition.
Best way to hunt this down is to change it to SELECT * and look at each row returned. You should be able to spot the difference then ie. there will be column where the value is different between two duplicate rows. The table that column comes from is the one that you need to be more selective on.
Cheers
Ben