Sql query to generate this output

Question

Hi,
I have a table as follows;
SET_MASTER
ID set_id attribute_id attribute_value
1 1 2 10
2 1 3 20
3 1 4 50
4 1 5 60
5 2 2 10
6 2 3 30
7 2 4 40
8 2 5 50
I want to generate an output as folllows;
Attr_id Set1_attr_value Set2_attr_value min_attr_value max_attr_value
2 10 10 10 10
3 20 30 20 30
4 50 40 40 50
5 60 50 50 60
Please provide the query to generate this output.
Thanks.

Answer 1

SQL> create table set_master (id,set_id,attribute_id,attribute_value)
  2  as
  3  select 1, 1, 2, 10 from dual union all
  4  select 2, 1, 3, 20 from dual union all
  5  select 3, 1, 4, 50 from dual union all
  6  select 4, 1, 5, 60 from dual union all
  7  select 5, 2, 2, 10 from dual union all
  8  select 6, 2, 3, 30 from dual union all
  9  select 7, 2, 4, 40 from dual union all
10  select 8, 2, 5, 50 from dual
11  /
Tabel is aangemaakt.
SQL> select attribute_id attr_id
  2       , max(decode(set_id,1,attribute_value)) set1_attr_value
  3       , max(decode(set_id,2,attribute_value)) set2_attr_value
  4       , least(max(decode(set_id,1,attribute_value)),max(decode(set_id,2,attribute_value))) min_attr_value
  5       , greatest(max(decode(set_id,1,attribute_value)),max(decode(set_id,2,attribute_value))) max_attr_value
  6    from set_master
  7   group by attribute_id
  8   order by attribute_id
  9  /
   ATTR_ID SET1_ATTR_VALUE SET2_ATTR_VALUE MIN_ATTR_VALUE MAX_ATTR_VALUE
         2              10              10             10             10
         3              20              30             20             30
         4              50              40             40             50
         5              60              50             50             60
4 rijen zijn geselecteerd.Regards,
Rob.