SQL查询-在不同条件下两次显示同一列

Question

I am wondering if the following is possible. Say I have the following table:

1 | John
2 | Bob
3 | John
4 | Bob

Is it possible to run a query that results in the following:

John | 1 | 3
Bob | 2 | 4

EDIT

Sorry for the confusion. My question addresses instances where I need to handle the possibility of 2 duplicates for a large data set.

Answer 1

Assuming exactly 2 duplicates

SELECT 
   NAME, 
   MIN(ID) as ID1,
   MAX(ID) as ID2
FROM Table t
GROUP BY NAME

Answer 2

This should work. Note that the subquery screens out all names that don't have exactly two id s.

select name,min(id) as id1,max(id) as id2
from table
join(
    select name
    from table
    group by name
    having count(1)=2
)names
using(name)
group by name;

Answer 3

If there are exactly two rows with each name, then the following should work:

 SELECT a.name,
        a.id as id1,
        b.id as id2
 FROM the_table a 
   JOIN the_table b ON a.name = b.name AND a.id <> b.id