Compare table structures in different schemas. help please

Question

Hi all,
I have a question...
I have tables on different schemas some thing like
Schema A
Table 1
Table 2
Table 3
Schema B
Table 1
Table 2
Table 3
Now situation is Table 1 and Table 2 will have similar structure or Table 1 in Schema B will have additional columns.
like so... on... for all other tables...
example !
Schema A:
Desc Table 1;
Name                                  Type            Null
No                                Number            Notnull
Name                           Varchar2(10)     Not null
Fee                              Number (10,2)   Not null
Scheam B;
Desc Table1;
Name                                  Type               Null
DX_No                                Number            Notnull
DX_Name                           Varchar2(10)      Not null
DX_Fee                              Number (10,2)   Not null
comments                          Varchar(2)        Now I need to write a procedure sort of thing to compare these tables which are in different in column names in both schema and get it exported to Excel sheet.
and here thing is first three columns SHOULD BE TREATED AS SAME even though prefix of DX_ exist since REST OF THE PART OF COLUMN NAME IS SAME.
and in same way commets is new coloumn in schema B only..So that should be highlighted excel sheets..
I am not sure how OAD or SQL Developer handle this...Is there any plsql block I can write to do above..
Thanks in advance..

Answer 1

An example of one method (this is just a starting point, you'll have to build it out to suit your needs).
create table emp as select * from scott.emp where 1=0;
alter table emp add (junk number(1));
select
      t1.column_name as t1_column_name
   ,  t2.column_name as t2_column_name
from
   select column_name
   from
      dba_tab_columns
   where
      table_name  = 'EMP'
   and
      owner       = user
) t1
full outer join
   select column_name
   from
      dba_tab_columns
   where
      table_name  = 'EMP'
   and
      owner       = 'SCOTT'
) t2
on (t1.column_name = t2.column_name)
where
   t1.column_name is null
or
   t2.column_name is null;
T1_COLUMN_NAME                 T2_COLUMN_NAME
JUNK
1 row selected.
TUBBY_TUBBZ?If you need to remove prefix's ... you would just do that in the select list (using regexp_replace, translate, substr, whatever you think is appropriate for your situation).
Edited by: Tubby on Nov 6, 2010 12:38 PM
Forgot to mention that this code will report differences between two schemas, regardless of where the additional columns reside ... if you have a 'master' schema that is the definitive source, then you would want to use the query provided by Xtender.