Question

我需要旋转桌子。以下是我的疑问。

CREATE TABLE SurveyResponses (
    id int,
    question varchar(255),
    answer varchar(255)
);

INSERT INTO SurveyResponses (id, question, answer)  values (1, 'question 1', 'responseX');
INSERT INTO SurveyResponses (id, question, answer)  values (2, 'question 1', 'responseY');
INSERT INTO SurveyResponses (id, question, answer)  values (3, 'question 1', 'responseZ');
INSERT INTO SurveyResponses (id, question, answer)  values (4, 'question 2', 'responseA');
INSERT INTO SurveyResponses (id, question, answer)  values (5, 'question 2', 'responseB');
INSERT INTO SurveyResponses (id, question, answer)  values (6, 'question 3', 'responseC');

当我尝试使用带有问题的数据透视表作为我得到的列时

<块引用>

ORA-00936：缺少表达式

我在查询中遗漏了什么？我希望它是动态的，因为我在真实表格中有 500 多个问题。

查询

SELECT * FROM (
    SELECT id, question, answer from SurveyResponses
) SurveyResponsesResults
PIVOT (
    MAX(answer)
    FOR question
    In(
        SELECT DISTINCT question FROM SurveyResponses
    )
) As pivottable;

Answer 1

IN 不能动态。使用第 7 行而不是（注释）第 8 行。

SQL> select * from (
  2      select id, question, answer from SurveyResponses
  3  ) SurveyResponsesResults
  4  PIVOT (
  5      max(answer)
  6      For question
  7      In('question 1' as q1, 'question 2' as q2, 'question 3' as q3
  8          --SELECT DISTINCT question FROM SurveyResponses
  9      )
 10  ) ;

        ID Q1         Q2         Q3
---------- ---------- ---------- ----------
         1 responseX
         6                       responseC
         2 responseY
         4            responseA
         5            responseB
         3 responseZ

6 rows selected.

SQL>

Answer 2

扩展@Littlefoot 回答。

如果我必须在 IN 中使用动态输入。

我将不得不使用 PIVOT XML 和 xmlserialize 查询如下。

SELECT xmlserialize(content pivottable.question_XML) from (
    SELECT id, question, answer from SurveyResponses
) SurveyResponsesResults
PIVOT XML (
    Max(answer)
    FOR question
    In(
        SELECT DISTINCT question FROM SurveyResponses
    )
) pivottable ;

查询有效，但以 XML 格式输出。

我想弄清楚如何将 XML 转换为 TABLE。如果您知道，请随时进行编辑。

ORA-00936: 使用枢轴时缺少表达式

2 个答案: