Here's some more details:
The following query:
SELECT * FROM tblpemdruglink WHERE drugid = 'DG-5039';
returns the following results:
drugid | monographid
---------+-------------DG-5039 | 2008
(1 row)
the following query:
SELECT * FROM tblfdbmono WHERE monographid='2008' AND versionid='FDB-PE' AND category='PEM';
returns the following results:
versionid | category | monographid | sequencenumber | sectioncode | linetext
-----------+----------+-------------+----------------+-------------+---------------------------------------------------------------------
{content}
sorry, the {content} is what's under NDA :(
In any case, you can see the structure of the tables tblpemdruglink and
tblfdbmono from here.
Now the following query:
SELECT sequencenumber,sectioncode,linetext FROM tblfdbmono fdb, tblpemdruglink pem WHERE
fdb.monographid=pem.monographidAND fdb.versionid='FDB-PE' AND fdb.category='PEM' AND pem.drugid='DG-5039';
Should return the same results as the second query above. However, this
is what I get:
sequencenumber | sectioncode | linetext
----------------+-------------+----------
(0 rows)
And it takes about 3-4 seconds to return with that prognosis. What's
going on here?
-Brice
Peter Eisentraut wrote:
>
> Brice Ruth writes:
>
> > SELECT
> > a.Number,
> > a.Code,
> > a.Text
> > FROM
> > b,
> > a
> > WHERE
> > (b.Id = a.Id) AND
> > (VersionId = 'key1') AND
> > (Category = 'key2') AND
> > (b.d_Id = 'key3')
> > ORDER BY
> > a.Number;
> >
> > (my apologies: I had to 'mangle' the table/column names because of NDA)
> >
> > So my question is this: would this query operate differently in MySQL
> > than in PostgreSQL? The reason I ask is that this query in MySQL
> > returns results, yet in PostgreSQL it does not.
>
> Without showing the tables and the data in it, it's fairly hard to tell.
> I think MySQL does case insensitive string comparisons; check that.
>
> > I read a post about PostgreSQL not supporting outer joins, but I don't
> > have enough experience with SQL to determine if this is such a query
> > or not. Please advise.
>
> This is not an outer join.
>
> --
> Peter Eisentraut peter_e@gmx.net http://yi.org/peter-e/
--
Brice Ruth
WebProjkt, Inc.
VP, Director of Internet Technology
http://www.webprojkt.com/
