Hi narenda ,
FIRST YOU HAVE TO REMOVE EXTRA CHARACTERS FROM 'di10452' WHICH ARE 'di' then you apply inner join.
select * from table1 t1 (nolock) inner join table2 t2 on t1.col1 = SUBSTRING (t2.col1,3,LEN(t2.col1))
note the statement
SUBSTRING (t2.col1,3,LEN(t2.col1)) = SUBSTRING ( 'di10452', 3, LEN('di10452')) = 10452