converting group by lst element to string

Dear all,

I am using group by node to collect data from different rows; all source data from type string

I have choosen list option in group by node. In the corresponding element I see correct values. (=ok)

If it comes to multiple hits, Knime uses

[ ]

around the value and , for separating the values.

I have to join the elements from group by to existing table using value lookup (=ok)

The type of this element from group by is list showing

[...]

in its header.

3 questions:

How can I convert it into string? (I have to write this field into an access db)

How can I replace the

[ ]

(by using replace?)

Can I cange the , as value separator to e.g. ; (, is already used in the value by user; so I have it multiple times, for separating by Knime and by the user using it in the normal value)

Thx for help!

BR,

Heinz