Arup Rakshit wrote
> ORDER BY parent_id, id ?
>
> François Beausoleil
>
> parent_id .. But why order_by.. I thought I need to group by
>
> parent child email
> 1 2
> test1@
> 3 email
The word "group" as you have used it can mean:
"Generate a single record for each parent with all children combined into
that record."
or
"Physically order the output so that while each child still has its own
record all children of the same parent are listed consecutively"
The first solution requires GROUP BY, the second requires ORDER BY
It would help if you could show an example of what you want the output to
look like.
David J.
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