Question

我正在尝试根据表中存在的行动态生成列。

我有一张如下表 -

 Name  |  Sub  |  Marks
 A     |Hindi  |59
 A     |Eng    |88
 A     |Maths  |68

但是，我需要如下结果 -

 Name  |  Sub  |  Marks  |  Sub  |  Marks  |  Sub  |  Marks
 A     |Hindi  |59       |Eng    |88       |Maths  |68

我无法如何实现同样的目标。非常感谢任何帮助。

Answer 1

SQL Fiddle

Oracle 11g R2架构设置：

CREATE TABLE table_name ( Name, Sub, Marks ) AS
SELECT 'A', 'Hindi', 59 FROM DUAL UNION ALL
SELECT 'A', 'Eng',   88 FROM DUAL UNION ALL
SELECT 'A', 'Maths', 68 FROM DUAL;

查询1 ：

SELECT *
FROM   (
  SELECT t.*,
         ROW_NUMBER() OVER ( PARTITION BY name ORDER BY ROWNUM ) AS rn
  FROM   table_name t
)
PIVOT (
  MAX( Sub ) AS SUB,
  MAX( Marks ) AS Marks
  FOR rn IN ( 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 )
)

<强> Results ：

| NAME | 1_SUB | 1_MARKS | 2_SUB | 2_MARKS | 3_SUB | 3_MARKS |  4_SUB | 4_MARKS |  5_SUB | 5_MARKS |  6_SUB | 6_MARKS |  7_SUB | 7_MARKS |  8_SUB | 8_MARKS |  9_SUB | 9_MARKS | 10_SUB | 10_MARKS |
|------|-------|---------|-------|---------|-------|---------|--------|---------|--------|---------|--------|---------|--------|---------|--------|---------|--------|---------|--------|----------|
|    A | Hindi |      59 |   Eng |      88 | Maths |      68 | (null) |  (null) | (null) |  (null) | (null) |  (null) | (null) |  (null) | (null) |  (null) | (null) |  (null) | (null) |   (null) |

动态列在结果集中生成

1 个答案: