Re: Help with SQL query (and outer joins...)

Is this work from a class?

Daniel Morgan

Steven Garcia wrote:

> I actually think a better example would be the following. I have two
> tables...
>
> Table 1: Table 2:
> Logday ID PageHits Logday ID UserHits
> -------- ---- ---------- -------- ---- ---------
> 20-02 400 10 20-02 400 5
> 20-02 500 5 20-02 600 5
> 21-02 400 5 21-02 500 10
> 21-02 300 15 21-02 300 10
>
> I want to create a view that contains the "union" of both these tables..so
> the resultset would look like
>
> Logday ID PageHits UserHits
> ----------- ---- ---------- ----------
> 20-02 400 10 5
> 20-02 500 5 0
> 20-02 600 0 5
> 21-02 400 5 0
> 21-02 500 0 10
> 21-02 300 15 10
>
> Notice in the columns where no data is present in either one of the parent
> tables, a "0" is supplied. A few things...
>
> 1) Table 1 and Table 2 are guaranteed to contain complete rows (not "20-02
> 400 0").
> 2) It's OK for the resulting table to have rows where there is 0 in both
> the PageHits and UserHits column, or if the
> resulting table doesn't contain those rows.
>
> I'm having trouble formulating a view (sql query) for this. Any help?
>
> Thanks, Steve
>
> "Steven Garcia" <sgarcia_at_inktomi.com> wrote in message
> news:3ca4e358$1_at_digink...
> > I'm having trouble with a view I'm developing. For the simplified
> > version...I have two views that look like:
> >
> > View 1:
> > Logday (date, 'ddd') totalcount
> > --------------------- -----------
> > 20-FEB-2002 10
> > 21-FEB-2002 20
> >
> > View 2:
> > Logday (date, 'ddd') revenue
> > --------------------- ----------
> > 21-FEB-2002 5.00
> > 22-FEB-2002 8.00
> >
> > I want to create an uber view from both of these views that it will look
> > like
> > Logday (date, 'ddd') totalcount revenue
> > --------------------- ---------- --------
> > 20-FEB-2002 10 0
> > 21-FEB-2002 20 5.00
> > 22-FEB-2002 0 8.00
> >
> > I know this is a perfect candidate for an outer join. The real example
> I'm
> > trying to do is more complicated because there are 4 views (each with a
> > logday column) and I want to create the uber view that has a column from
> > each of the 4 views, along with some other data that will exist across all
> > four views (so there won't be a need to do a outer-join on those columns.)
> >
> > How do I construct such a query? I'm trying to solve my problem in such a
> > way that my uber view will look like
> > the following...
> >
> > Logday col1 col2 col3
> > col4
> > ------------------- ---------- ---------- ---------- ----------
> --
> > 20-FEB-2002 0 1 15
> 0
> > 21-FEB-2002 20 10 0 23
> > 22-FEB-2002 14 0 14 0
> > 23-FEB-2002 0 4 0
> > 34
> >
> > where I have 0 in the columns where the data doesn't exist from my
> "feeder"
> > views.
> >
> > We are currently solving this problem by having a job on a daily basis do
> > this population in a table, but our business requirements have changed
> such
> > that the current implementation is not suitable. I'm a little worried
> about
> > performance of this view but these reporting tables are not access often
> in
> > our application (so a performance hit is something that I will accept.)
> >
> > Thanks for your help,
> > Steve Garcia
> >
> >
Received on Fri Mar 29 2002 - 15:58:18 CST