On Fri, 03 Feb 2006 15:17:39 +1100, Gordon Heydon <gordon(a)heydon.com.au> wrote :
> Hi,
>
> I have been trying to work out a small sql issue, and I was wondering if
> someone might be able to help me.
>
> Basically I have 2 tables and I was to do a left join and pull out all
> rows which has a value in the right hand table or doesn't exist.
>
> eg.
>
> SELECT a.a, a.b, b.a, b.c FROM a LEFT JOIN b ON a.a = b.a WHERE b.c =
> 'A';
>
Your where clause is going to limit you to only rows where b.c = 'A'.
> So basically I want it to return.
>
> a b a c
> 1 1 null null
> 2 2 2 A
>
So you will probably want to add 'OR b.a is null' (or however you have the
lack of value defined) to your WHERE above.
Pat
