Question

鉴于此表：

SELECT 
  t1.MODEL as MODEL,
  t1.DATE as DATE
  t1.RESULT as RESULT_1,
  t1.SECTION as SECTION_1,
  t2.RESULT as RESULT_2,
  t2.SECTION as SECTION_2
FROM table t1
INNER JOIN table t2
ON t1.DATE = t2.DATE AND t1.MODEL = t2.MODEL
WHERE t2.section > t1.section AND
      t2.result < t1.result

我想确保每个部分（对于相同的日期/型号），结果始终大于或等于任何前一部分。

e.g。如果第7行的结果小于第6行的结果，我需要将第7行设置为等于第6行的结果。

同样，如果第5行的结果小于第2行的结果，我需要将第5行的结果设置为第2行的结果。

我能够找到这样的情况，其中较高部分的值低于使用自连接的前一部分，如下所示：

MODEL   DATE    SECTION_1   RESULT_1    SECTION_2   RESULT_2
AABBCC  1/1/2001    3   42.2    4   35.4
AABBCC  1/1/2001    6   95.3    7   76.5

产生以下内容：

MERGE INTO table new
USING (

SELECT 
  t1.MODEL as MODEL,
  t1.DATE as DATE
  t1.RESULT as RESULT_1,
  t1.SECTION as SECTION_1,
  t2.RESULT as RESULT_2,
  t2.SECTION as SECTION_2
FROM table t1
INNER JOIN table t2
ON t1.DATE = t2.DATE AND t1.MODEL = t2.MODEL
WHERE t2.section > t1.section AND
      t2.result < t1.result 
) old

ON (new.DATE = old.DATE AND new.section > old.section)
WHEN MATCHED THEN
UPDATE
SET new.result = old.result;

我试图合并这样的数据：

from skimage.restoration import denoise_nl_means,denoise_wavelet

但是我收到以下错误：

错误报告 - SQL错误：ORA-30926：无法获得稳定的一组源表中的行 30926. 00000 - “无法在源表中获得稳定的行集” *原因：由于dml较大，无法获得稳定的行集活动或非确定性的where子句。 *操作：删除任何非确定性where子句并重新发出dml。

Answer 1

MERGE INTO table new
USING (
SELECT  MODEL,
        DATE,
        RESULT,
        SECTION
FROM (
SELECT 
  t1.MODEL as MODEL,
  t1.DATE as DATE,
  MAX(t1.RESULT) OVER (PARTITION BY t1.MODEL ORDER BY t1.SECTION) as RESULT,
  t1.SECTION as SECTION,
  t1.RESULT as OLD_RESULT
FROM table t1)
WHERE OLD_RESULT != RESULT
) old
ON (new.DATE = old.DATE AND new.section = old.section and new.MODEL = old.MODEL )
WHEN MATCHED THEN
UPDATE
SET new.result = old.result;

Oracle：从自联接更新

1 个答案: