Re: problems with SELECT query results

[Joshua <joshua(at)joshuaneil(dot)com>]

Hello,

Thank you all for your assistance. I did end up finding NULL in the 
'onorder' column which should have been zero's.... this was in a test 
table that happened to have some NULL in it for one reason or another 
but I should not find this in the production version of the table.

I also appreciate you pointing out the COALESCE function. I will find 
that helpful in future work.

I look forward to hopefully assisting you guys with some of your 
PostgreSQL dilemmas in the future!

Thanks again!!!

-Joshua

Richard Huxton wrote:
> Joshua wrote:
> > Hello,
> >
> > I am new to this list and have been working with PostgreSQL since 
> > January.
> >
> > Here is my problem, I hope someone here has some experience or can 
> > point me in the right direction. I am writing the following query for 
> > a C# program I am writing:
> >
> > SELECT 'PV.LINEITEM:' || partnum || ',' || round(onhand) || ',' || 
> > round(qm5) || ',' || round(lsm4) || ',' || ',' || ',' || 
> > round(onorder) || ',' || ',' || ',' || binone || ',' || ',' || 
> > round(backorderqty) || ',' || ',' || round(onhold) || ',' || ',' || 
> > ',' || ',' || ',' || ',' || ',' || round(qtyperjob) || ',' || 
> > round(ordermax) AS gmrim FROM slparts WHERE vendor LIKE 'CH%'
> >
> > The query does work and I am getting results from the database. There 
> > are values for all 'partnum' in the database, however, the query 
> > results include blank fields here and there in between the returned 
> > records. Why am I receiving blank fields for 'gmrim'???? This 
> > absolutely defies logic and I cannot find any rhyme or reason for 
> > this problem. I cannot have any blank rows in the query, and again 
> > the database is completely populated with values.
>
> I'm not sure it is - I think you've got a NULL somewhere.
>
> Since NULL means "unknown" ('text' || NULL) = NULL
>
> Wrap all your column-references in COALESCE: e.g. COALESCE(partnum,'') 
> and see if that solves it. If so, go back and find rows WHERE partnum 
> IS NULL and correct them. Then set the NOT NULL constraint on the 
> relevant columns.