Re: Basic SQL join question

On Fri, 31 Jan 2003, Jean-Christian Imbeault wrote:

> Sorry for this simple question but I can't seem to get Postgres to do
> what I want ...
>
> I want to get the concatenation of 2 or more tables with absolutely
> nothing in common. How can I do this?
>
> For example
>
> Table a:
>
> a
> -----
> a1
> a2
> a3
>
> Table b:
>
> b
> -----
> b1
> b2
>
> Table c:
>
> c
> -----
> c1
> c2
> c3
> c4
>
> What is the proper SQL to return:
>
> a | b | c
> ---------------
> a1 b1 c1
> a2 b2 c2
> a3 c3
> c4
>

I can't think of a real SQL solution (although there might be
one). A pl function could do this but it'd be a little wierd
probably. Note that unless those tables are really selects with
ordering the results are pretty indeterminate and probably
meaningless since order is not guaranteed.