原数据：
id code name value
----------- ---------- --------
1 2014000 A 10
2 2014000 B 9
3 2014001 C 100
4 2014002 D 4
5 2014002 E 5
6 2014003 F 9
7 2014003 G 10
期望结果：
code name1 value1 name2 value2
----------- --------- --------- --------- ---------
2014000 A 10 B 9
2014001 C 100 null null
2014002 D 4 E 5
2014003 F 9 G 10
注意：同1个ID最多只2条记录，会出现相同value。
CREATE TABLE # (ID INT, code INT, NAME CHAR(1), VALUE VARCHAR(10))
INSERT INTO # VALUES
(1,2014000,'A',''),
(2,2014000,'B',''),
(3,2014001,'C',''),
(4,2014002,'D',''),
(5,2014002,'E',''),
(6,2014003,'F',''),
(7,2014003,'G','')
SELECT
code,MIN(name) AS name1,MIN(CAST(REPLACE(value,' ','') AS INT)) AS value1,
CASE COUNT(ID) WHEN 1 THEN NULL ELSE MAX(name) END AS name2,
CASE COUNT(ID) WHEN 1 THEN NULL ELSE MAX(CAST(REPLACE(value,' ','') AS INT)) END AS value2
FROM
#
GROUP BY
code
