Excellent! Thank you very much. However I forgot to include an additional clause in my question. There are numerous records that do not have a control_number or record_type and I want to keep all of these records. i.e.
update_datetime control_number record_type
2010-12-29-9.30.10...
newbie with rudimentary knowledge of SQL queries here...trying to eliminate erroneous records with specific criteria. here is what i'm trying to accomplish:
select
update_datetime
,control_number
,record_type
from table1 inner join table2
on table1.field = table2.field
where update_datetime...
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