Query to get subtotals and totals

Question

Hi
I have write a query which gives results in the following form:
Name Jan Feb Mar
A1 54 3 43
A2 1 23 53
A3 34 23 23
Subtotal A 98 49 119
B1 23 12 34
B2 12 2 14
Subtotal B 35 14 48
Total 133 63 167
I mean getting the subtotal and then totals.
Does anybody know how to do this?

Answer 1

Jeneesh, like your solution.. simple and elegant. But..... ;)
If you use NVL you can't distinguish between a "NULL value" and a record which was added because of the ROLLUP.. it might be better to use GROUPING to determine if the row was added to the result set because of the ROLLUP
Notice the difference between these two queries
SQL> with test as
  2  (
  3  select 'A1' name, 54 jan, 3  feb,  43 mar from dual union all
  4  select 'A2' name, 1  jan, 23 feb,  53 mar from dual union all
  5  select 'A3' name, 34 jan, 23 feb,  23 mar from dual union all
  6  select 'B1',  23 ,12, 34 from dual union all
  7  select null, null, null, null from dual union all
  8  select 'B2',  12 ,2 ,14  from dual
  9  )
10  select nvl(name,n1) name,jan,feb
11  from(
12  select name,substr(name,1,1) n1,sum(jan) jan,sum(feb) feb from test
13  group by rollup(substr(name,1,1),name)
14  );
NAME        JAN        FEB
A1           54          3
A2            1         23
A3           34         23
A            89         49
B1           23         12
B2           12          2
B            35         14
            124         63
10 rows selected.
SQL> with test as
  2  (
  3  select 'A1' name, 54 jan, 3  feb,  43 mar from dual union all
  4  select 'A2' name, 1  jan, 23 feb,  53 mar from dual union all
  5  select 'A3' name, 34 jan, 23 feb,  23 mar from dual union all
  6  select 'B1',  23 ,12, 34 from dual union all
  7  select null, null, null, null from dual union all
  8  select 'B2',  12 ,2 ,14  from dual
  9  )
10  select decode (grouping (substr(name,1,1)), 1, 'Total', substr (name, 1, 1)) n1
11       , decode (grouping(name), 1, 'Name total',name)
12       , sum(jan) jan
13       , sum(feb) feb
14    from test
15   group by rollup (substr(name,1,1)
16                   ,name
17                   );
N1    DECODE(GRO        JAN        FEB
      Name total
A     A1                 54          3
A     A2                  1         23
A     A3                 34         23
A     Name total         89         49
B     B1                 23         12
B     B2                 12          2
B     Name total         35         14
Total Name total        124         63
10 rows selected.
SQL>