Dear all,
I would like to define threads in message system for replies to message but if
I define too many level, I am afraid I have problem in the select...
Say, I have define 3 levels:
1
/ \
2 3
/\ \
4 5 6
It means message 2 is a reply to 1.
4 is a further follow-up of 2...etc
In table format, I would present it with
Table A
ParentId ChildId
1 2
1 3
2 4
2 5
3 6
I think I can issue the command to join table A 3 times to give the following
result
1st 2nd 3rd
Row1 1 2 4
Row2 1 2 5
Row3 1 3 6
But can I show
a. which level each node belongs
b. no. of child nodes it has
altogether in one "select" sql
and if the level exceeds 3, how can I do it?
Many thanks.....
Best regards,
Boris
