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我正在编写一个复杂的 SQL 语句来呈现多个维度的数据，

---------------------------------
YEAR  |  MONTH   | ARTICLVALUE  |
---------------------------------
2013       01        45665
2013       02        2364
2013       03        98736
2013       04        6623541
2013       05        9856
2012       02        23102
2012       06        10002
2012       07        120

我想这样介绍

-----------------------------------------------------
YEAR       |  MONTH1  |  MONTH2  |  MONTH3  |.......
---------------------------------------------------
    2013       45665      2364       98736

是否可以使用 SQL 语句？

4

1 回答 1

1

PIVOT在 10g 中尚不可用（它仅出现在 11g 中，并且在 techdo 的答案中显示），所以你必须解决这个问题。这是一种可能的方法：

SQL小提琴

Oracle 11g R2 模式设置：

CREATE TABLE DATA
    ("Y" int, "M" int, "V" int)
;

INSERT ALL 
    INTO DATA ("Y", "M", "V")
         VALUES (2013, 01, 45665)
    INTO DATA ("Y", "M", "V")
         VALUES (2013, 02, 2364)
    INTO DATA ("Y", "M", "V")
         VALUES (2013, 03, 98736)
    INTO DATA ("Y", "M", "V")
         VALUES (2013, 04, 6623541)
    INTO DATA ("Y", "M", "V")
         VALUES (2013, 05, 9856)
    INTO DATA ("Y", "M", "V")
         VALUES (2012, 02, 23102)
    INTO DATA ("Y", "M", "V")
         VALUES (2012, 06, 10002)
    INTO DATA ("Y", "M", "V")
         VALUES (2012, 07, 120)
SELECT * FROM dual
;

查询 1：

select 
y 
,max(m1) m1
,max(m2) m2
,max(m3) m3
,max(m4) m4
,max(m5) m5
,max(m6) m6
,max(m7) m7
,max(m8) m8
,max(m9) m9
,max(m10) m10
,max(m11) m11
,max(m12) m12
from (
  select 
   y
  ,decode(m, 1, v) m1
  ,decode(m, 2, v) m2
  ,decode(m, 3, v) m3
  ,decode(m, 4, v) m4
  ,decode(m, 5, v) m5
  ,decode(m, 6, v) m6
  ,decode(m, 7, v) m7
  ,decode(m, 8, v) m8 
  ,decode(m, 9, v) m9
  ,decode(m, 10, v) m10
  ,decode(m, 11, v) m11
  ,decode(m, 12, v) m12
  from data
) t
group by y

结果：

|    Y |     M1 |    M2 |     M3 |      M4 |     M5 |     M6 |     M7 |     M8 |     M9 |    M10 |    M11 |    M12 |
--------------------------------------------------------------------------------------------------------------------
| 2013 |  45665 |  2364 |  98736 | 6623541 |   9856 | (null) | (null) | (null) | (null) | (null) | (null) | (null) |
| 2012 | (null) | 23102 | (null) |  (null) | (null) |  10002 |    120 | (null) | (null) | (null) | (null) | (null) |
于 2013-05-16T10:13:55.897 回答