- Using a query to update existing records.
- update t1 set t1.timefield = s2.AvgOfTIME
- from yourtable t1
- inner join
- (
- -- you query for calculating avg time
- )
- as t2
- on t1.Process1 = t2.Process1 and t1.Week2 = t2.Week2 and t1.Operator3 = t2.Operator3 and t1.Shift4 = t2.Shift4