Question

我在oracle中有一个表，我想以矩阵形式转换它

表1：我有两种具有相应权重的用户

  User_name  M_User    Total
    user 1    user 2     7
    user 1    user 3     19
    user 1    user 7     5
    user 3    user 2     1
    user 2    user 7     1

最终结果应该是这样的：用户1 - ＆gt;用户2的权重为7，因此该值出现在该单元格中，依此类推

            user 1 user 2 user 3  user 7
user 1        0        7     19       5
user 3        0        1      0       0
user 2        0        0      0       1
user 7        0        0      0       0

我尝试了枢轴功能但是

 SELECT *
FROM   (SELECT USER_NAME, M_USER, TOTAL
        FROM   TEST)
PIVOT  (MAX(TOTAL)  FOR (M_USER) IN ('user 2' AS User2, 'user 3' AS User3 , 'user7' AS User7))

第一个问题是它显示'用户7'的空值而它不应该，第二个问题是我的文件中有很多数据（107k记录，包括重复），对于有限的数据，如上所述我可以使用'user 2'AS User2，'user 3'AS User3，'user7'AS User7在IN命令之后如果有这么大的数据怎么能写这行？当然我不能在IN之后写100k记录

我正在运行107k记录数据的脚本，我得到上面提到的错误，该代码适用于小数据集，但不适用于我的原始数据集

CREATE OR REPLACE FUNCTION GETUSERS RETURN SYS_REFCURSOR AS
  QUERY CLOB;
  RC SYS_REFCURSOR;
BEGIN

  QUERY := 'SELECT USERS.USER_NAME ';

  FOR TMP IN (SELECT DISTINCT UPPER(REPLACE(USER_NAME, ' ', '')) USER_NAME FROM (SELECT USER_NAME FROM TEST UNION ALL SELECT M_USER FROM TEST) ORDER BY USER_NAME)
  LOOP
  QUERY := QUERY || '  , MAX(COALESCE(TEST.' || TMP.USER_NAME || ' , 0)) ' || TMP.USER_NAME;
  END LOOP;

  QUERY := QUERY || ' FROM ( ';
  QUERY := QUERY || '  SELECT DISTINCT USER_NAME ';
  QUERY := QUERY || '  FROM ( ';
  QUERY := QUERY || '  SELECT USER_NAME FROM TEST ';
  QUERY := QUERY || '  UNION ALL ';
  QUERY := QUERY || '  SELECT M_USER FROM TEST ';
  QUERY := QUERY || '  ) ';
  QUERY := QUERY || '  ) USERS ';
  QUERY := QUERY || '  LEFT OUTER JOIN ( ';

  QUERY := QUERY || ' SELECT USER_NAME';
  FOR TMP IN (SELECT DISTINCT USER_NAME, REPLACE(USER_NAME, ' ', '') USER_COL_NM FROM (SELECT USER_NAME FROM TEST UNION ALL SELECT M_USER FROM TEST))
  LOOP
  QUERY := QUERY || ', CASE WHEN M_USER = ''' || TMP.USER_NAME
  || ''' THEN TOTAL ELSE 0 END AS ' || TMP.USER_COL_NM ;
  END LOOP;
  QUERY := QUERY || ' FROM TEST';

  QUERY := QUERY || '  ) TEST ON USERS.USER_NAME = TEST.USER_NAME ';
  QUERY := QUERY || 'GROUP BY USERS.USER_NAME ';
  QUERY := QUERY || 'ORDER BY USERS.USER_NAME';

  OPEN RC FOR QUERY;

  RETURN RC;
END;
/

我得到的错误是

Error starting at line 2 in command:
EXEC :RC := GETUSERS;
Error report:
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
ORA-06512: at "GETUSERS", line 10
ORA-06512: at line 1
06502. 00000 -  "PL/SQL: numeric or value error%s"
*Cause:    
*Action:
RC
------

我已经阅读了与此类似的其他问题，并且所有人都建议设置DBMS_OUTPUT.ENABLE(500000);我试过但它给了我未知的命令错误，所以我手动将缓冲区大小设置为DBMS OUTPUT中的无限制但是我我仍然得到错误，任何帮助？

Here is a link to my earlier question about this

PL / SQL：数字或值错误：字符串缓冲区太小（缓冲区大小不受限制）

0 个答案: