Question

我正在寻找一种在Oracle SQL中转置或旋转表的方法。对于这种情况，SELECT中只有一行，但是有多列。

示例：

SELECT
  id AS "Id",
  name AS "Name",
  some_value AS "Favorite color"
FROM
  table
WHERE
  id = 5;

结果：

id | name | some_value
--- ------ -----------
5   John    Orange

我希望看到的是：

Id             | 5
Name           | John
Favorite color | Orange

我知道PIVOT，但我很难在这种情况下看到一个简单的代码。

Answer 1

您可以取消显示列以获得此结果，如下所示：

select fld, val
from (
    select to_char(id) as "Id", -- convert all columns to same type 
            name as "Name",
            some_value as "Favorite color"
      from your_table
     where id = 5
    ) unpivot(val for fld in("Id", "Name", "Favorite color"));

Answer 2

使用简单的UNION ALL子句

SELECT 'Id' As field_name, cast( id as varchar2(100)) as Value FROM "TABLE" where id = 5
UNION ALL
SELECT 'Name' , name FROM "TABLE" where id = 5
UNION ALL
SELECT 'Favorite color' , some_value FROM "TABLE" where id = 5;

Answer 3

Frank Ockenfuss给出了我正在寻找的答案。谢谢，弗兰克！

但是，稍微更改会使列名更改更容易：

SELECT * FROM (
  SELECT
    TO_CHAR(id) AS id,
    TO_CHAR(name) AS name,
    TO_CHAR(some_value) AS fav_color
  FROM my_table
  WHERE id = 5
) UNPIVOT(value FOR key IN(
  id AS 'Id',
  name AS 'Name',
  fav_color AS 'Favorite color'
));

结果：

key           | value
-------------- ------
Id              5
Name            John
Favorite color  Orange

Oracle SQL：转置/旋转具有一行和多列的表结果

3 个答案: