Hi Kalyan,
as Fred already wrote, you should check if SVC_ACCT_NUM is highly skewed (which will, btw, also result in a skewed target table):
Just remove all other columns from your query and run
SELECT ISA.SVC_ACCT_NUM AS "TOLL FREE CORP ID", count(*)
from ...
group by 1
order by 1 desc
Dieter
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