On Fri, 14 Sep 2001, Philippe Parmentier wrote:
> > as per the manual, when joining 2 tables, if one entry is not found in the
> > second table , a null records is displayed, but in that small example,
> > it's not working like this:
Philippe,
the very fine manual says:
* If there is no matching record for the right table in the `ON' or
`USING' part in a `LEFT JOIN', a row with all columns set to
`NULL' is used for the right table.
while you are doing a full join. MySQL behaves exactly as
described and expected.
Thomas Spahni
> > CREATE TABLE test1 (
> > number tinyint(3) unsigned NOT NULL DEFAULT '0' ,
> > PRIMARY KEY (number));
> >
> > INSERT INTO test1 VALUES("1");
> > INSERT INTO test1 VALUES("2");
> > INSERT INTO test1 VALUES("3");
> >
> > CREATE TABLE test2 (
> > number tinyint(3) unsigned NOT NULL DEFAULT '0' ,
> > cnumber char(10) NOT NULL DEFAULT '' , PRIMARY KEY (number)
> > );
> >
> > INSERT INTO test2 VALUES("1","one");
> > INSERT INTO test2 VALUES("2","two");
> >
> > if you do :
> >
> > select test1.number,test2.cnumber from test1,test2 where
> > test1.number=test2.number
> >
> >
> > the result is
> >
> > number cnumber
> > 1 one
> > 2 two
> >
> >
> > instead of
> >
> > number cnumber
> > 1 one
> > 2 two
> > 3
> >
> > Regards
> >
> > Philippe Parmentier
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