偶遇Oracle行转列

行转列应该是数据库比较常见的操作了，在oracle中可以使用pivot、decode，可以参考呆瓜的blog：

http://blog.csdn.net/ch7543658/article/details/41146809

SELECT name,
MAX(DECODE(course, 'java', gread)) AS java,
MAX(DECODE(course, 'c#', gread)) AS c#,
MAX(DECODE(course, 'c', gread)) AS c,
MAX(DECODE(course, 'sql', gread)) AS sql
FROM t
GROUP BY name;

NAME             JAVA         C#          C        SQL
---------- ---------- ---------- ---------- ----------
dai                60         70         80         90
tu                 90         80         70         60

实际写报表时遇到一个变异的行转列要求：

数据列pocket_ID,Serial_Number大约查到50多行记录:



要求按照pocket_ID的顺序将serial_Number 按照每行8个数据的格式写出来，即



与呆瓜中提到的例子相比，因为没有一个合适的group字段，所以在将阶梯表转为报表时稍微费了点心思，添加了一个辅助字段实现了所需功能：

select max(A) as A,max(B) as B,max(C) as C,max(D) as D,max(E) As E,max(F) As F,max(G) as G,Max(H) as H from
(SELECT trunc((P.POCKET_ID-1)/8,0) as RM,
DECODE(MOD(POCKET_ID,  8), 1, SERIAL_NUMBER) AS A,
DECODE(MOD(POCKET_ID,  8), 2, SERIAL_NUMBER) AS B,
DECODE(MOD(POCKET_ID,  8), 3, SERIAL_NUMBER) AS C,
DECODE(MOD(POCKET_ID,  8), 4, SERIAL_NUMBER) AS D,
DECODE(MOD(POCKET_ID,  8), 5, SERIAL_NUMBER) AS E,
DECODE(MOD(POCKET_ID,  8), 6, SERIAL_NUMBER) AS F,
DECODE(MOD(POCKET_ID,  8), 7, SERIAL_NUMBER) AS G,
DECODE(MOD(POCKET_ID,  8), 0, SERIAL_NUMBER) AS H
FROM 数据表
WHERE 1 = 1
and 其他条件
ORDER BY POCKET_ID asc) M
group by M.RM order by RM asc

查询结果: