Question

I am facing a problem with GROUP BY clause, and the data is not showing up as I would like to have:

I have the data like this:

-------------------------------------------------------------------
| Company   | Division | Business Area | Unit   | Name Full  | ID |
-------------------------------------------------------------------
| Company 1 | Div 1    | Business 1    | Unit 1 | Customer 1 | 01 |
| Company 1 | Div 1    | Business 1    | Unit 1 | Customer 2 | 02 |
| Company 1 | Div 1    | Business 1    | Unit 2 | Customer 3 | 03 |
| Company 1 | Div 1    | Business 3    | Unit 3 | Customer 2 | 02 |
| Company 1 | Div 2    | Business 1    | Unit 1 | Customer 4 | 04 |
....
....

In UI, I would like to have it displayed like this:

Company 1, Div 1, Business 1, Unit 1
   -- Customer 1  01
   -- Customer 2  02
Company 1, Div 1, Business 1, Unit 2
   -- Customer 3 03
Company 1, Div 1, Business 3, Unit 3
   -- Customer 2 02
Company 1, Div 2, Business 1, Unit 1
   -- Customer 4 04

I tried the query, and if I try to group by only using company, div, business and unit then I get the error: 00979: not a group by expression as I am not using all columns as I used in SELECT, but then I don’t get my required result.

Any idea how may I proceed?

Answer 1

Jaanna,

Your example dataset has 5 rows and your expected output contains 9 rows. Those extra 4 rows are aggregations per (company,division,business_area,unit) where name_full and id are being rolled up.

Your example data:

SQL> create table mytable (company,division,business_area,unit,name_full,id)
  2  as
  3  select 'Company 1', 'Div 1', 'Business 1', 'Unit 1', 'Customer 1', '01' from dual union all
  4  select 'Company 1', 'Div 1', 'Business 1', 'Unit 1', 'Customer 2', '02' from dual union all
  5  select 'Company 1', 'Div 1', 'Business 1', 'Unit 2', 'Customer 3', '03' from dual union all
  6  select 'Company 1', 'Div 1', 'Business 3', 'Unit 3', 'Customer 2', '02' from dual union all
  7  select 'Company 1', 'Div 2', 'Business 1', 'Unit 1', 'Customer 4', '04' from dual
  8  /

Table created.

The query:

SQL> select company
  2       , division
  3       , business_area
  4       , unit
  5       , name_full
  6       , id
  7    from mytable
  8   group by company
  9       , division
 10       , business_area
 11       , unit
 12       , rollup((name_full,id))
 13   order by company
 14       , division
 15       , business_area
 16       , unit
 17       , grouping(name_full) desc
 18       , name_full
 19  /

COMPANY   DIVISION BUSINESS_AREA UNIT   NAME_FULL  ID
--------- -------- ------------- ------ ---------- --
Company 1 Div 1    Business 1    Unit 1
Company 1 Div 1    Business 1    Unit 1 Customer 1 01
Company 1 Div 1    Business 1    Unit 1 Customer 2 02
Company 1 Div 1    Business 1    Unit 2
Company 1 Div 1    Business 1    Unit 2 Customer 3 03
Company 1 Div 1    Business 3    Unit 3
Company 1 Div 1    Business 3    Unit 3 Customer 2 02
Company 1 Div 2    Business 1    Unit 1
Company 1 Div 2    Business 1    Unit 1 Customer 4 04

9 rows selected.

You might want to conditionally display some column values or not, but I leave that as an exercise to you.

Regards,
Rob.