How to group by one column and concatinate records from another col

hi,
i want to fill a list-item in forms 6i with one cursor. i need a cursor / sql-function that fetch the data from the following table structur. it looks like this:
col1 col2
group1 01
group1 02
group2 03
group3 04
group2 05
group1 06
the resultset should look like this:
label value
group1 01.02.06
group2 03.05
group3 04
any ideas ?
thanks in advance.
greets Kevin

Try this
table X2
columns a and b
SELECT a
, LTRIM(MAX(SYS_CONNECT_BY_PATH(b,'.'))
KEEP (DENSE_RANK LAST ORDER BY curr),'.') AS concatenated
FROM ( SELECT a
, b
, ROW_NUMBER() OVER (PARTITION BY a ORDER BY b) AS curr
, ROW_NUMBER() OVER (PARTITION BY a ORDER BY b) -1 AS prev
FROM x2 )
GROUP BY a
CONNECT BY prev = PRIOR curr AND PRIOR a = a
START WITH curr = 1
Pls. Confirm if it works..

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