FULL JOIN Issue

Question

I'm having trouble grasping the concept of a full join. I googled it and didn't find a good explanation of what it is exactly.
My boss told me to use it so i'm working on getting what it truely is and how I can use it.
Thank you

Answer 1

jerry8989 wrote:
I need the results to be like this:
tableid columnid value PercentValue
1 1 2 99.99
1 1 3
1 1 4
But the percent value for the bottom 2 rows should be null
test@ORA10G>
test@ORA10G> --
test@ORA10G> with table1 as (
  2    select 1 tableid, 1 columnid, 2 value from dual union all
  3    select 1, 1, 3 from dual union all
  4    select 1, 1, 4 from dual),
  5  table2 as (
  6    select 1 tableid, 1 columnid, 99.99 percentvalue from dual)
  7  --
  8  select p.tableid,
  9         p.columnid,
10         p.value,
11         case p.rn
12           when 1 then q.percentvalue
13           else null
14         end as percentvalue
15    from (
16  select tableid,
17         columnid,
18         value,
19         row_number() over (partition by tableid,columnid order by 1) as rn
20    from table1) p,
21    table2 q
22  where q.tableid = p.tableid(+)
23    and q.columnid = p.columnid(+);
   TABLEID   COLUMNID      VALUE PERCENTVALUE
         1          1          2        99.99
         1          1          4
         1          1          3
test@ORA10G>
test@ORA10G>
is this possible with a full outer join?Doesn't seem like a full outer join is even needed, given your data.
isotope