使用另一個列表的值更新列表（表有重復項）

Question

我需要用另一個表的值更新表中的列（表有重復項）。 我嘗試了幾個代碼，但它給了我錯誤

錯誤：更新已取消：嘗試使用來自多個連接行的值更新目標行

這是我的代碼：

UPDATE SERGIU_BI_CCM_AGG_MTH t1
  SET t1.CURRENT_SEC = foo.CURRENT_SEC
  FROM (
  SELECT t1a.sub_id, t1a.CURRENT_BRAND, t2.CURRENT_SEC, t2.from_date,      
  t2.to_date
  FROM SERGIU_BI_CCM_AGG_MTH t1a
     LEFT JOIN BI_CCM_BASE t2
     ON t1a.sub_id = t2.sub_id and t1a.CURRENT_BRAND = t2.CURRENT_BRAND
  )
  foo 
WHERE t1.sub_id = foo.sub_id and t1.CURRENT_BRAND = foo.CURRENT_BRAND    
 and  t1.agg_mth between to_char(foo.from_date,'YYYYMM') and   
 to_char(foo.to_date-1,'YYYYMM');

誰能幫我？

Answer 1

我認為您可以使用以下兩種方式：

• 與“加入”

UPDATE SERGIU_BI_CCM_AGG_MTH t1
    LEFT JOIN BI_CCM_BASE t2
        ON t1.sub_id = t2.sub_id and t1.CURRENT_BRAND = t2.CURRENT_BRAND
  SET t1.CURRENT_SEC = t2.CURRENT_SEC
WHERE t1.agg_mth between to_char(t2.from_date,'YYYYMM') and   
 to_char(t2.to_date-1,'YYYYMM');

• 沒有“加入”：

UPDATE SERGIU_BI_CCM_AGG_MTH t1, BI_CCM_BASE t2
  SET t1.CURRENT_SEC = t2.CURRENT_SEC
WHERE t1.sub_id = t2.sub_id and t1.CURRENT_BRAND = t2.CURRENT_BRAND 
 and  t1.agg_mth between to_char(t2.from_date,'YYYYMM') and   
 to_char(t2.to_date-1,'YYYYMM');

希望這可以幫助：:)

Answer 2

重復導致錯誤，讓我們使用row_number()獲取每個sub_id和CURRENT_BRAND的唯一記錄。

試試下面的查詢

UPDATE SERGIU_BI_CCM_AGG_MTH t1
SET t1.CURRENT_SEC = foo.CURRENT_SEC
FROM (
        SELECT t1a.sub_id
            , t1a.CURRENT_BRAND
            , t2.CURRENT_SEC
            , t2.from_date
            , t2.to_date
            , row_number() over (partition by t1a.sub_id,CURRENT_BRAND order by from_date desc) as rn
        FROM SERGIU_BI_CCM_AGG_MTH t1a
        LEFT JOIN BI_CCM_BASE t2 ON t1a.sub_id = t2.sub_id 
            and t1a.CURRENT_BRAND = t2.CURRENT_BRAND
      )foo 
WHERE t1.sub_id = foo.sub_id 
    and t1.CURRENT_BRAND = foo.CURRENT_BRAND    
    and t1.agg_mth between to_char(foo.from_date,'YYYYMM') and to_char(foo.to_date-1,'YYYYMM');
    and foo.rn = 1

Answer 3

您需要以下查詢。

    UPDATE SERGIU_BI_CCM_AGG_MTH t1
    SET t1.CURRENT_SEC = (SELECT  t2.CURRENT_SEC   
    FROM SERGIU_BI_CCM_AGG_MTH t1a
    LEFT JOIN BI_CCM_BASE t2
    ON t1a.sub_id = t2.sub_id and t1a.CURRENT_BRAND = t2.CURRENT_BRAND
WHERE t1.sub_id = foo.sub_id and t1.CURRENT_BRAND = foo.CURRENT_BRAND    
      and  t1.agg_mth between to_char(foo.from_date,'YYYYMM') and   
      to_char(foo.to_date-1,'YYYYMM'))