Pl / SQL-oracle 9i-手动透视

如何解决Pl / SQL-oracle 9i-手动透视

|| 我们有一个包含三列的表：

Customer_name,Age_range,Number_of_people.
1              1-5         10
1              5-10        15

我们需要将不同年龄范围的所有人数作为单个查询的行返回。如果我们搜索客户＃1，则查询应仅返回一行：

Header- Age Range (1-5)             Age Range (5-10)
        10                             15

我们需要将所有结果都放在一行中。当我查询客户1时，结果应该是单个行组中的人数乘以

age_range

。 解决这个问题的最佳方法是什么？     

解决方法

        您需要手动执行数据透视：

  SELECT   SUM(CASE WHEN age_range = \'5-10\' 
                    THEN number_of_people 
                    ELSE NULL END) AS nop5,SUM(CASE WHEN age_range = \'10-15\' 
                    THEN number_of_people 
                    ELSE NULL END) AS nop10
    FROM   customers
   WHERE   customer_name = 1;

    ,        在9i之后增加了使用LISTGAGG，COLLECT或其他功能的10g和11g的简单解决方案，但我相信以下内容将在9i中起作用。 来源（http://www.williamrobertson.net/documents/one-row.html） 您只需要将deptno替换为customer_name，将ename替换为Number_of_people

SELECT deptno,LTRIM(SYS_CONNECT_BY_PATH(ename,\',\'))
FROM   ( SELECT deptno,ename,ROW_NUMBER() OVER (PARTITION BY deptno ORDER BY ename) -1 AS seq 
         FROM   emp ) 
WHERE  connect_by_isleaf = 1
CONNECT BY seq = PRIOR seq +1 AND deptno = PRIOR deptno 
START WITH seq = 1;


    DEPTNO CONCATENATED
---------- --------------------------------------------------
        10 CLARK,KING,MILLER
        20 ADAMS,FORD,JONES,SCOTT,SMITH
        30 ALLEN,BLAKE,JAMES,MARTIN,TURNER,WARD

3 rows selected.

    ,        这将创建一个存储的“ 5”，表示您可以随时访问它。

CREATE OR REPLACE FUNCTION number_of_people(p_customer_name VARCHAR2)
RETURN VARCHAR2
IS
  v_number_of_people NUMBER;
  v_result VARCHAR2(500);

  CURSOR c1
  IS
    SELECT Number_of_people FROM the_table WHERE Customer_name = p_customer_name;
BEGIN
  OPEN c1;
  LOOP
    FETCH c1 INTO v_number_of_people;
    EXIT WHEN c1%NOTFOUND;

    v_result := v_result || v_number_of_people || \' \' || CHR(13);
  END;
END;

要运行它，请使用：

SELECT number_of_people(1) INTO dual;

希望对您有所帮助，请让我知道是否有任何错误，我自己没有对该函数进行测试。     ,        做就是了

select Number_of_people
from table
where Customer_name = 1

我们缺少一些细节吗？