Merging data in a single SQL table without a Cursor

Question

I have a table with an ID column and another column with a number. One ID can have multiple numbers. For example

ID | Number
 1 |  25
 1 |  26
 1 |  30
 1 |  24
         


        

Answer 1

CREATE TABLE Table1
    ([ID] int, [Number] int)
;

INSERT INTO Table1
    ([ID], [Number])
VALUES
    (1, 25),
    (1, 26),
    (1, 30),
    (1, 24),
    (2, 4),
    (2, 8),
    (2, 5)
;

    select ID, 
           MIN(Number)
         ,(SELECT MIN(Number) 
                  FROM (SELECT TOP 2 Number from Table1 WHERE ID =
                  T1.Id ORDER BY Number DESC) as DT)
    from Table1 as T1
    GROUP BY ID
    UNION 
    SELECT ID, MAX(Number), MAX(Number)
    FROM Table1 as T1
    GROUP BY ID;

Live Example