Comparing totals from the same table

Question

I am trying to compare data from the same table..
i am using an alias of the table to set up the select but i am running into a cartesian set.
I am comparing data (totals) from different dates from the same table ; i have included the query which is giving me a problem:
select a.date_in,b.date_in,a.Table_name,
DECODE(a.schema_name,
'EZLIVE','ITP','EZAC','ACT','OTHER')AS DEPT,
a.type,
a.status,
a.TOTAL,
b.total
from agg_results a,agg_results b
where a.schema_name=b.schema_name
and to_char(a.date_in,'mm/dd/yyyy')='&date_in'
and to_char(b.date_in,'mm/dd/yyyy')='&date_in';
any help thanks
Ellery

Answer 1

I think you need to join in-line views instead of the tables directly. something like:
SELECT a.date_in,b.date_in,a.table_name,a.dept,a.type,a.status,a.total,b.total
FROM (SELECT date_in,table_name,
             DECODE(schema_name,'EZLIVE','ITP',
                                'EZAC','ACT','OTHER') dept,
             type,status,total
      FROM agg_results
      WHERE date_in = to_date('&date_in','mm/dd/yyyy') a,
     (SELECT date_in,table_name,
             DECODE(schema_name,'EZLIVE','ITP',
                                'EZAC','ACT','OTHER') dept,
             type,status,total
      FROM agg_results
      WHERE date_in = to_date('&date_in','mm/dd/yyyy') b
WHERE a.dept = b.deptTTFN
John