SQL Query with 3 tables to create a view

Question

Hi
I have got an existing view "View_output" formed with a query which works fine:
select A,B,C,D,E,F,G,H from GTS1 where D is not null
    UNION
   select A,B,C,D,E,F,G,H from GTSN1 where D is not null;It works fine, in the output I have columns A,B,C,D,E,F,G,H
New requirement : Modify the view, by adding a new column 'I' so that the view should have
columns A through I, and no column values should be null.
This column "I" is coming from a table, say DLC
Data in DLC is a subset of the original view "View_output"and DLC have the foll.columns:
("View_output" is a datablock source for a form and only selected column values are put as output in DLC
after form manipulation)
DLC is having only 5 columns -B,C,F,H,I
When I give:
(select A,B,C,D,E,F,G,H,NULLfrom GTS1 where D is not null
    UNION
   select A,B,C,D,E,F,G,H,NULL from GTSN1 where D is not null)
UNION
select NULL,B,C,NULL,NULL,F,NULL,H,I
    from
    DLC where I IS NOT NULL;It UNIONS all required rows in the 3 tables but columns A,D,E,G are NULL, but how can I get
data in these columns?
Edited by: Krithi on 30-Oct-2009 05:43
Edited by: Krithi on 30-Oct-2009 08:13

Answer 1

Hi arun thats not the real isue..
I have corrected the second code now, it was a typo from my side..
all three tables already have 9 columns selected..
The view created from GTS1 and GTSN1 is constantly changing
There is no way to add column 'I' to any of these above tables
The view is the input to a form..User ticks a tickbox corresponding to records needed by them (These are the columns in the original view mentioned above)..and based on certain logic,only selected columns are now inserted/updated into the output table through the form..this is the table DLC
Now they want to insert a new data(free text) through the form, this field correspond to each record in the form ;this is supposed to be column 'I'(not designed yet)..
this is not there in the original input tables selected for the view...But then I added this column to the output table DLC (Cant think of any other method) so that column I can also get combined in the view.
Now what I want is recreate the view through,
create or replace view statement.
the view should effectively pull data from 3 tables .
The relation between 3 tables :
DLC is a subset of GTS1 and GTSN1
but may also contain data which is not in union of GTS1 and GTSN1
Only field I need from DLC is field 'I', and that too if the data is there in the union of GTS1 and GTSN1