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I have an SQL statement like this, I want to add a key to the table

Select t1.ColA, t1.ColB, t1.ColC, t2.ColA, t1.ColD
from myLib.Table1 t1
join myLib.Table2 t2
on t1.ColA = t2.ColA and t1.ColB = t2.ColB
where t1.ColA = 208
and t1.ColR = 'Y'
and t1.ColB in
Select t1b.ColB
from myLib.Table1 t1b
where t1b.ColA = 208
and t1b.ColR != 'Y'
and t1b.ColM = 2023
with data

I want to add a key to the result table myLib.ResultTbl.
I have tried adding 'primary key (t1.ColA, t1.ColB)' but not working.
Is my only option to follow this create with a create index?

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