How to match sql Query following Scenario

hi

I have both table
table1 id-int
table2 testId-varchar


how to match both column

now i try to modify column testid to int
did not changed here i have data in my table how to match convert int
most urgent

my query this
================
cast(id as int)=cast(testid as int)

Mark as Answer if its helpful to you

Kumaraspcode2009@gmail.com