oracle- JOIN 2 tables with 2 ID's in common - oracle

Question

table "team1" :
id country
1 India
2 Pakistan
3 srilanka
4 England
table "team2" :
id name name2
1 2 4
2 1 3
i have to combine two tables
another table when retrieve the data that time in place of 2 , 4 Pakistan,England

Answer 1

It is about the self join of team1 table (lines #15 and 16):
SQL> with
2 team1 (id, country) as
3 (select 1, 'India' from dual union all
4 select 2, 'Pakistan' from dual union all
5 select 3, 'Sri Lanka' from dual union all
6 select 4, 'England' from dual
7 ),
8 team2 (id, name, name2) as
9 (select 1, 2, 4 from dual union all
10 select 2, 1, 3 from dual
11 )
12 select b.id,
13 t1.country,
14 t2.country
15 from team2 b join team1 t1 on t1.id = b.name
16 join team1 t2 on t2.id = b.name2
17 order by b.id;
ID COUNTRY COUNTRY
---------- --------- ---------
1 Pakistan England
2 India Sri Lanka
SQL>

Answer 2

Just showing another way of writing the same query with aggregate functions and grouping.
with
team1 (id, country) as
(select 1, 'India' from dual union all
select 2, 'Pakistan' from dual union all
select 3, 'Sri Lanka' from dual union all
select 4, 'England' from dual
),
team2 (id, name, name2) as
(select 1, 2, 4 from dual union all
select 2, 1, 3 from dual
)
SELECT
T2.ID,
MAX(CASE
WHEN T2.NAME = T1.ID THEN T1.COUNTRY
END) AS TEAM1,
MAX(CASE
WHEN T2.NAME2 = T1.ID THEN T1.COUNTRY
END) AS TEAM2
FROM
TEAM2 T2
JOIN TEAM1 T1 ON T1.ID IN (
T2.NAME,
T2.NAME2
)
GROUP BY
T2.ID
ORDER BY
T2.ID;
Output:
ID TEAM1 TEAM2
---------- --------- ---------
1 Pakistan England
2 India Sri Lanka
Cheers!!