Need some help over sql query format

Question

Input :
TABLE 1 ppl
id name
1 ravi
2 andy
3 john
TABLE 2 fa_ppl
id attr_name attr_value
1 watch Guess
1 laptop Sony
2 fashion casual
2 laptop Dell
3 watch fossil
3 fashion formal
OUTPUT Required:(3 rows)
name watch laptop fashion
ravi guess sony NULL
andy NULL dell casual
john fossil NULL formal
SQL Statements that may help in schema objects:
create table ppl(id number,name varchar2(50));
create table fa_ppl(id number,attr_name varchar2(20), attr_value varchar2(20));
insert into ppl values(1,'ravi');
insert into ppl values(2,'andy');
insert into ppl values(3,'john');
insert into fa_ppl values(1,'laptop','sony');
insert into fa_ppl values(1,'watch','guess');
insert into fa_ppl values(2,'laptop','dell');
insert into fa_ppl values(2,'fashion','casual');
insert into fa_ppl values(3,'fashion','formal');
insert into fa_ppl values(3,'watch','fossil');
I tried in the below way:
Select P.name,
case when attr_name='fashion' then attr_value end as fashion ,
case when attr_name='laptop' then attr_value end as laptop,
case when attr_name='watch' then attr_value end as watch,
from ppl P join fa_ppl F on (P.id=F.id and F.attr_name in ('fashion','laptop','watch'))
PROBLEM:
Getting separate rows(6 rows in my case) for each attribute_value.
Thanks a lot.....

Answer 1

What you are trying is a pivot. There is a [url https://forums.oracle.com/forums/thread.jspa?threadID=2174552#9360005]thread in the FAQ linking to various methods.
You are actually pretty close, if you just do a group by on your select:
Select P.name,
max(case when attr_name='fashion' then attr_value end) as fashion ,
max(case when attr_name='laptop' then attr_value end) as laptop,
max(case when attr_name='watch' then attr_value end) as watch
from ppl P join fa_ppl F on (P.id=F.id and F.attr_name in ('fashion','laptop','watch'))
group by
p.nameBut if you have several people with same name, you probably want to do this:
Select
p.id, /*you may omit this column if you do not need it*/
max(P.name) as name,
max(case when attr_name='fashion' then attr_value end) as fashion ,
max(case when attr_name='laptop' then attr_value end) as laptop,
max(case when attr_name='watch' then attr_value end) as watch
from ppl P join fa_ppl F on (P.id=F.id and F.attr_name in ('fashion','laptop','watch'))
group by
p.idSimilar can be done in 11G with the PIVOT statement. See the links in the FAQ thread.