Not exists with CTE taking more time .

hi ll

 i am having query like this format

with b as

(

 select query -row return:11252 -10 sec

union all

select query - row return 55163 - 2 sec

)

 select column1,column2,column3 from Tablename(row retun:35 time:45 sec) where NOT EXISTS(select 1 from b)

but over all query taking more than 10 min, how to improve the performance pls help me.

give some suggestion.

Thanks - SelvaKumarSubramaniam.Please MARK AS ANSWER, if my answer is useful to U.