Displaying the row number

Question

I am having the data as like below(sample data)
Col1 Col2
A AA
A BB
A CC
B BA
B BB
C CA
D DA
D DB
E EA
E EB
I want to show the seq number as a third column as like below. (seq number is with respect to Col1)
Col1  Col2  num
A      AA     1
A      BB     1
A      CC     1
B BA 2
B BB 2
C      CA     3
D DA 4
D DB 4
E      EA     5
E      EB     5
Thanks in Advance,
Bala

Answer 1

Hi,
Try this
WITH T AS (
SELECT 'A' AS COL1, 'AA' AS COL2 FROM DUAL UNION ALL
SELECT 'A','BB' FROM DUAL UNION ALL
SELECT 'A','CC' FROM DUAL UNION ALL
SELECT 'B','BA' FROM DUAL UNION ALL
SELECT 'B','BB' FROM DUAL UNION ALL
SELECT 'C','CA' FROM DUAL UNION ALL
SELECT 'D','DA' FROM DUAL UNION ALL
SELECT 'D','DB' FROM DUAL UNION ALL
SELECT 'E','EA' FROM DUAL UNION ALL
SELECT 'E','EB' FROM DUAL)
SELECT COL1, COL2, RANK() OVER (partition by col1 order by col2) FROM Tor
WITH T AS (
SELECT 'A' AS COL1, 'AA' AS COL2 FROM DUAL UNION ALL
SELECT 'A','BB' FROM DUAL UNION ALL
SELECT 'A','CC' FROM DUAL UNION ALL
SELECT 'B','BA' FROM DUAL UNION ALL
SELECT 'B','BB' FROM DUAL UNION ALL
SELECT 'C','CA' FROM DUAL UNION ALL
SELECT 'D','DA' FROM DUAL UNION ALL
SELECT 'D','DB' FROM DUAL UNION ALL
SELECT 'E','EA' FROM DUAL UNION ALL
SELECT 'E','EB' FROM DUAL)
SELECT COL1, COL2, dense_RANK() OVER (order by col1) FROM T@peter - apologies for replying to your post
cheers
VT
Edited by: VT on Jan 27, 2011 7:47 PM