create table #tmp12
(
isqno int ,
crow1 VARCHAR(10),
crow2 VARCHAR(10)
)
insert into #tmp12 values(1,'A','Z')
insert into #tmp12 values(2,'A','Y')
insert into #tmp12 values(3,'B','X')
insert into #tmp12 values(4,'B','W')
select isqno,crow1,DENSE_RANK() over(order by crow1 ) Group_order,
crow2
from #tmp12
isqno crow1 Group_order crow2
1 A 1 Z
2 A 1 Y
3 B 2 X
4 B 2 W
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