用INNER加入更新查詢

我有兩個MANUAL_TRANSACTIONS和MANUAL_LIST_TEMP表。我想要實現的是使用MANUAL_LIST_TEMP中的信息更新MANUAL_TRANSACTIONS。這裏只有MANUAL_LIST_TEMP表中存在的記錄應更新爲MANUAL_TRANSACTIONS。用INNER加入更新查詢

我已經做了類似於下面的事情，但以下語句的問題是它更新MANUAL_TRANSACTIONS表中的每條記錄。

UPDATE MANUAL_TRANSACTIONS 
SET ("Age", "Assigned_To", "Attachments", "Comments", "Completed_Date_Time" 
, "Content_Type", "Created", "Created_By","Cycle_Time (Crt to Complete)" 
, "Cycle_Time (First reply)", "DISTRIBUTION_CHANNEL")= 
     (SELECT MANUAL_LIST_TEMP."Age", MANUAL_LIST_TEMP."Assigned_To", 
     MANUAL_LIST_TEMP."Attachments", MANUAL_LIST_TEMP."Comments", 
     MANUAL_LIST_TEMP."Completed_Date_Time", MANUAL_LIST_TEMP."Content_Type", 
     MANUAL_LIST_TEMP."Created", MANUAL_LIST_TEMP."Created_By", 
     MANUAL_LIST_TEMP."Cycle_Time (Crt to Complete)", 
     MANUAL_LIST_TEMP."Cycle_Time (First reply)", 
     MANUAL_LIST_TEMP."Distribution_Channel" 
     FROM MANUAL_LIST_TEMP 
     WHERE MANUAL_LIST_TEMP.ID = MANUAL_TRANSACTIONS.ID)

來源

2013-08-07 santhosha

你也應該在WHERE子句添加到您的UPDATE語句：

UPDATE MANUAL_TRANSACTIONS 
SET ("Age", "Assigned_To", "Attachments", "Comments", "Completed_Date_Time" 
, "Content_Type", "Created", "Created_By","Cycle_Time (Crt to Complete)" 
, "Cycle_Time (First reply)", "DISTRIBUTION_CHANNEL")= 
     (SELECT MANUAL_LIST_TEMP."Age", MANUAL_LIST_TEMP."Assigned_To", 
     MANUAL_LIST_TEMP."Attachments", MANUAL_LIST_TEMP."Comments", 
     MANUAL_LIST_TEMP."Completed_Date_Time", MANUAL_LIST_TEMP."Content_Type", 
     MANUAL_LIST_TEMP."Created", MANUAL_LIST_TEMP."Created_By", 
     MANUAL_LIST_TEMP."Cycle_Time (Crt to Complete)", 
     MANUAL_LIST_TEMP."Cycle_Time (First reply)", 
     MANUAL_LIST_TEMP."Distribution_Channel" 
     FROM MANUAL_LIST_TEMP 
     WHERE MANUAL_LIST_TEMP.ID = MANUAL_TRANSACTIONS.ID) 
WHERE MANUAL_TRANSACTIONS.ID IN (SELECT MANUAL_LIST_TEMP.ID FROM MANUAL_LIST_TEMP);

爲了達到最佳效果，將您的UPDATE轉換爲MERGE語句：

MERGE INTO MANUAL_TRANSACTIONS tgt 
USING (
     SELECT MANUAL_LIST_TEMP.ID, 
     MANUAL_LIST_TEMP."Age", MANUAL_LIST_TEMP."Assigned_To", 
     MANUAL_LIST_TEMP."Attachments", MANUAL_LIST_TEMP."Comments", 
     MANUAL_LIST_TEMP."Completed_Date_Time", MANUAL_LIST_TEMP."Content_Type", 
     MANUAL_LIST_TEMP."Created", MANUAL_LIST_TEMP."Created_By", 
     MANUAL_LIST_TEMP."Cycle_Time (Crt to Complete)", 
     MANUAL_LIST_TEMP."Cycle_Time (First reply)", 
     MANUAL_LIST_TEMP."Distribution_Channel" 
     FROM MANUAL_LIST_TEMP 
) src 
ON (tgt.ID = src.ID) 
WHEN MATCHED THEN UPDATE 
SET tgt."Age" = src."Age" 
    , tgt."Assigned_To" = src."Assigned_To" 
    [...]

MERGE語句將僅更新在MANUAL_TRANSACTIONS行（該目標表），其具有在MANUAL_LIST_TEMP（所述源表）匹配的行。

來源

2013-08-07 10:32:14

感謝Danilo ..也可以告訴我，如果我使用更新語句，而不是合併，它會導致任何問題，如性能問題？ – santhosha

MERGE語句通常應該表現得更好，特別是對於大量的記錄。更新應該很好。一如既往，嘗試兩種方法並找出答案！ –

試試這個

UPDATE MANUAL_TRANSACTIONS 
    Set Age = MANUAL_LIST_TEMP.AGE, .... 
    From MANUAL_TRANSACTIONS 
    inner join MANUAL_LIST_TEMP on MANUAL_LIST_TEMP.ID = MANUAL_TRANSACTIONS.ID

來源

2013-08-07 10:27:17 Harshil

這是否會甚至工作？根據http://geekswithblogs.net/WillSmith/archive/2008/06/18/oracle-update-with-join-again.aspx和http://docs.oracle.com/cd/E11882_01/server.112 /e26088/statements_10008.htm#i2112182，它不應該。 –

是的，它在SQL中工作正常 – Harshil

這在Oracle中不起作用。 –

你需要一個更加其中FOR UPDATE子句

來源

2013-08-07 10:28:26

UPDATE MANUAL_TRANSACTIONS mt 
    left join MANUAL_LIST_TEMP mlt 
    on mt.ID = mlt.ID set mt.Age=mlt.Age .....

來源

2013-08-07 10:32:46 Anurag

這是否會工作？根據http://geekswithblogs.net/WillSmith/archive/2008/06/18/oracle-update-with-join-again.aspx和http://docs.oracle.com/cd/E11882_01/server.112 /e26088/statements_10008.htm#i2112182，它不應該。 –

是的，這將工作，你可以在這裏檢查http://stackoverflow.com/questions/3248531/mysql-update-query-using-a-left-join – Anurag

鏈接的問題是關於MySQL。這個問題是關於Oracle的。 –

請試試這個：

UPDATE MANUAL_TRANSACTIONS mt INNER JOIN MANUAL_LIST_TEMP mlt 
on mt.ID = mlt.ID set mt.Age=mlt.Age,mt.Assigned_To=mlt.Assigned_To, .....;

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2015-06-30 12:09:35

用INNER加入更新查詢

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