Not In

[jags79]

If any of the value doesnt exists in the values then the process Id should not come for that values

Like in the set of email id's if "AA" doesnt not exists then only those process_id
should be dispalyed who dont have that email id.

[iburyak]

Depend on your data try one of these:

Select email_id from table_name where  not exists(select process_id from table_name)
Or 
Select email_id from table_name where  process_id is null

Good Luck.