Re: embedded SQL Precompiler

[Raul A Jager <raul@xxxxxxxxxx>]

DB2 can fetch rows "n" to 'm" as you can see in the samples from the Net.Data
manual.  It works.

"M. Lazarus" wrote:

> Joe,
>
> At 2/20/02 10:18 PM, you wrote:
> > >   As compared to what?  The rest of the SQL world?  PLENTY!  A couple of
> > > examples:  How would you retrieve the top 10 of a list?  SQL Server and
> > > Oracle (I believe) have TOP XX.  How about ROWNUM, which would allow me to
> > > retrieve, say, rows 50-100?  This is on V4.5, so my apologies to Rochester
> > > if these have been added in 5.1.
>
> >Don't shoot me for asking, but how often do you retrieve an arbitrary number
> >of rows starting somewhere in the middle of a view?  Isn't that what a
> >scrollable cursor is for?  And I thought there was the ability to get the
> >first NN rows, but I could be wrong.  I'm no SQL expert.
>
>   I'm not an expert either, so some of my gripes may be in there, but I
> might not know about it.  Some of the techies in my shop know SQL Server
> and Oracle well and they might email me a simple solution to a situation
> and I try to run it under ISQL and it won't accept it.
>
>   I did see in a DB2 UDB manual that FETCH FOR n ROWS is valid, but ISQL
> won't accept that.  I don't want to create a program to run an ad hoc query.
>
>   I actually have a complex report to create.  One of the rows will
> represent a "Top 50 total" value.  I also wanted to be able to easily add a
> "Next 50 total" row.
>
> >1. Create a view of, say, invoices that were over 90 days, by customer and
> >date
> >2. Subselect out just the customer numbers from that set, showing them to
> >the user
> >3. Let the user pick a customer, and go back to the original result set and
> >then subselect for just that customer
> >
> >THIS would be power.  THIS would be a real boon to programming.  Sure, you
> >can do it by just re-running the SELECT over the whole file, but if the
> >selection criteria has any complexity to it, that's a lot of churning
> >against the database, when you already have the data selected from the
> >first pass.
>
>   I agree that this would be a real performance booster for large / complex
> tables.
>
>   -mark