如何更新mysql中另一個表中的多個字段？

Question

這是我試圖完成查詢：

update amdashboard 
set (ASCID, ASCFirst, ASCLast, ASCOtherName, ASCAdd1, ASCAdd2, 
    ASCCity, ASCState, ASCZip, ASCZip4, ASCY2007, ASCY2008, ASCY2009, 
    ASCY2010, ASCY2011, ASCY2012, ASCEthnicity, ASCGender, ASCMaritalStatus) 
= (select id, firstname, lastname, listingspousename, add1, add2, 
      city, state, zip, zip4, y2007, y2008, y2009, 
      y2010, y2011, y2012, Ethnicity, Gender, MaritialStatus 
    from ASCNCOAClean 
      inner join amdashboard 
      on ASCNCOAClean.firstname = amdashboard.actorsfirst 
      and ascncoaclean.lastname = amdashboard.actorslast) 
    where exists (select id, firstname, lastname, listingspousename, 
         add1, add2, city, state, zip, zip4, y2007, y2008, 
         y2009, y2010, y2011, y2012, Ethnicity, Gender, 
         MaritialStatus 
        from ASCNCOAClean 
         inner join amdashboard 
         on ASCNCOAClean.firstname = amdashboard.actorsfirst 
         and ascncoaclean.lastname = amdashboard.actorslast); 

我不能得到這個工作......在第一個括號收到一個語法錯誤。所以，我想我只會嘗試一個領域。我嘗試這樣做：

update amdashboard 
set ascid = (select ascncoaclean.id 
     from ASCNCOAClean 
     where ASCNCOAClean.firstname = amdashboard.actorsfirst 
          and ascncoaclean.lastname = amdashboard.actorslast) 
where exists (select ascncoaclean.id 
     from ASCNCOAClean 
     where ASCNCOAClean.firstname = amdashboard.actorsfirst 
          and ascncoaclean.lastname = amdashboard.actorslast); 

然而，這回報和錯誤1242：子查詢返回多個1行。這似乎很愚蠢。我知道它會返回多行...我想要它，因爲我需要更新多行。

我錯過了什麼？

Answer 1

你想會是這個樣子的查詢：

UPDATE amdashboard a, ASCNCOAClean b SET 
    a.ASCID   = b.id, 
    a.ASCFirst   = b.firstname, 
    a.ASCLast   = b.lastname, 
    a.ASCOtherName  = b.listingspousename, 
    ... 
    a.ASCMaritalStatus = b.MaritialStatus 
WHERE a.actorsfirst = b.firstname; 

觀察，你會與列協會沒寫其餘取代...。

但是請注意，這個問題告訴我這個查詢將會對你的數據庫做一些非常錯誤的操作，因爲你沒有使用唯一鍵來關聯這些表。如果有兩個相同的記錄ASCNCOAClean.firstname您肯定會丟失數據。

還觀察它要更新現有的記錄amdashboard，而不是添加新的。如果你的意圖是從遷移到ASCNCOAClean數據amdashboard假設amdashboard是一個全新的，空表，那麼你要查詢的是：

INSERT INTO amdashboard (
    ASCID, ASCFirst, ASCLast, ASCOtherName, ASCAdd1, ASCAdd2, ASCCity, ASCState, 
    ASCZip, ASCZip4, ASCY2007, ASCY2008, ASCY2009, ASCY2010, ASCY2011, ASCY2012, 
    ASCEthnicity, ASCGender, ASCMaritalStatus 
) 
SELECT 
    id, firstname, lastname, listingspousename, add1, add2, city, state, 
    zip, zip4, y2007, y2008, y2009, y2010, y2011, y2012, Ethnicity, Gender, 
    MaritialStatus 
FROM ASCNCOAClean;