Re: Optional join

On Thu, 14 Aug 2003, Slawek Jarosz wrote:

> Hi,
>
> I trying to write a query that will join 2 tables. Here's the concept:

> Table 1: table1, primary key pk1 Table 2: table2, primary key pk2
>
> One of the fields (f2) in table2 contains either the primary key of
> table1 or a NULL value. So normally a pretty basic query:
>
> SELECT table1.*, table2.pk2 FROM table1, table2 WHERE table2.f2 =
> table1.pk1;
>
> BUT what I would like to do is show all records of Table 1 even if
> there is no match in Table 2. Meaning that the reults could be
> table1... table2.pk2
> table1... NULL

See outer joins.

Something like:
SELECT table1.*,table2.pk FROM
table1 LEFT OUTER JOIN table on (table2.f2=table1.pk1);