Coplicated view - picking from a=b or from c&d =e

I realized there was something wrong with my view when an entire line
was missing. I believe it is caused by an inner join I did on one
column to create another column which may not actually have a value.
let me show you.
Table A ViewA ViewB
type1 type1
type2 type2
type3 type3
answer answer
Pretend that any / all items in Table A can be null. What I want the
view to do is either 1) have both viewA and ViewB answer show up even
if its null or 2) try to get viewB answer but if not, then go to ViewA
answer, then null.
Yes, that is a VIEW doing this...or so I hope.
Any ideas?
JohnRocketMan,
Try:
select
coalesce(c.c1, b.c1, a.c1)
from
tableA as a
full outer join
viewA as b
a.c1 = b.c1
full outer join
viewB as c
on a.c1 = c.c1
GO
AMB
"RocketMan" wrote:
> I realized there was something wrong with my view when an entire line
> was missing. I believe it is caused by an inner join I did on one
> column to create another column which may not actually have a value.
> let me show you.
> Table A ViewA ViewB
> type1 type1
> type2 type2
> type3 type3
> answer answer
> Pretend that any / all items in Table A can be null. What I want the
> view to do is either 1) have both viewA and ViewB answer show up even
> if its null or 2) try to get viewB answer but if not, then go to ViewA
> answer, then null.
> Yes, that is a VIEW doing this...or so I hope.
> Any ideas?
> John
>|||Better try this one:
SELECT
coalesce(c.c1, b.c1, a.c1) AS whatever
from
tableA as a
full outer JOIN
(
viewA as b
full outer join
viewB as c
ON b.c1 = c.c1
)
ON a.c1 = COALESCE(c.c1, b.c1)
GO
AMB
"Alejandro Mesa" wrote:
> RocketMan,
> Try:
> select
> coalesce(c.c1, b.c1, a.c1)
> from
> tableA as a
> full outer join
> viewA as b
> a.c1 = b.c1
> full outer join
> viewB as c
> on a.c1 = c.c1
> GO
> AMB
> "RocketMan" wrote:
> > I realized there was something wrong with my view when an entire line
> > was missing. I believe it is caused by an inner join I did on one
> > column to create another column which may not actually have a value.
> > let me show you.
> >
> > Table A ViewA ViewB
> > type1 type1
> > type2 type2
> > type3 type3
> > answer answer
> >
> > Pretend that any / all items in Table A can be null. What I want the
> > view to do is either 1) have both viewA and ViewB answer show up even
> > if its null or 2) try to get viewB answer but if not, then go to ViewA
> > answer, then null.
> >
> > Yes, that is a VIEW doing this...or so I hope.
> >
> > Any ideas?
> >
> > John
> >|||In a way, I answered my own question with a question...
When is a null not a null? When its a ''
Adding this to the views ( of other tables) made the join work and I
was able to get the line to appear.
THANKS for the help. I KNOW someone sometime will be searching for
this kind of help