How to get a similar value in Oracle

Question

I have a table of two columns

Col1  Col2
A        1
A        2
A        3
B        1
B        2
B        3

Output I need is like this

Answer 1

Here is a solution which would work for MySQL. It uses a correlated subquery in the select clause to group concatenate together Col2 values. The logic is that we only aggregate values which are less than or equal to the current row, for a given group of records sharing the same Col1 value.

SELECT
    Col1,
    (SELECT GROUP_CONCAT(t2.Col2 ORDER BY t2.Col2) FROM yourTable t2
     WHERE t2.Col2 <= t1.Col2 AND t1.Col1 = t2.Col1) Col2
FROM yourTable t1
ORDER BY
    t1.Col1,
    t1.Col2;

Demo

Here is the same query in Oracle:

SELECT
    Col1,
    (SELECT LISTAGG(t2.Col2, ',') WITHIN GROUP (ORDER BY t2.Col2) FROM yourTable t2
     WHERE t2.Col2 <= t1.Col2 AND t1.Col1 = t2.Col1) Col2
FROM yourTable t1
ORDER BY
    t1.Col1,
    t1.Col2;

Demo

Note that the only real change is substituting LISTAGG for GROUP_CONCAT.