How to use group concat to get the 'other' duplicate values?

Question

Hope the title makes sense!

Given a table MyTable with these values

   ID   TheValue
   A         1
   B         2
   C         3
   D         1
   E         1
   F         2

I can use

SELECT 
    TheValue,
    group_concat(concat) AS TheIDs
FROM (
    SELECT distinct
        TheValue,
        ID AS concat
    FROM MyTable)
GROUP BY TheValue

to get

TheValue   TheIDs  
   1         A,B,D
   2         B,F
   3         C

How can I instead get a result of ID, TheValue and the 'Other' IDs, not including the ID on that row?

eg

   ID     TheValue   OtherIDs
   A          1        D,E
   B          2        F
   C          3        <null> (or empty string, I don't mind)
   D          1        A,E
   E          1        A,D
   F          2        B

(I'm using SQLite in case an answer is dialect specific)

Answer 1

I think you need to do a self join:

SELECT  T.ID,
        T.TheValue,
        GROUP_CONCAT(T2.ID) AS TheIds
FROM    T
        LEFT JOIN T T2
            ON T2.TheValue = T.TheValue
            AND T2.ID != T.ID
GROUP BY T.ID, T.TheValue;

Example on SQL Fiddle

Answer 2

The first expected output from your question implies somehow that you need to normalize your database scheme, and to say, your Value is an ID and your IDs are values!

SELECT 
    TheValue,
    group_concat(ID) AS TheIDs
FROM MyTable
GROUP BY TheValue

Should do the job (at least in MySQL, I think in sqlite too).