Filter with row_Number column not getting., Sql Server

Filter with row_Number column not getting.

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Error(s), warning(s):

Invalid column name 'rno'.

  
roleid
comid

1
1
A

2
1
B

3
2
C

4
2
D

5
1
A


  
roleid
comid
rno

1
1
A
1

2
1
A
2

3
1
B
1

4
2
C
1

5
2
D
1

λ

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