基於同一個表中的值的 SQL 更新

Question

我試圖將這兩個查詢放在一起，但我不確定如何。 我正在嘗試將去年版本的相同預算表中的值復制到今年版本，基於它們具有相同的帳戶和工作訂單。

update tablename 
set depreciation = x.depreciation, 
    profile = x.profile, 
    description = x.description 
where version = '2019OP' 
     and account = x.account 
     and workorder = x.workorder

(select * from tablename where version = '2018OP' and batch = '') x

我在這個論壇上發現了與此類似的其他問題，但我找不到適合我的答案。

謝謝

編輯 - 這是 SQL Server 2012，兼容級別是 SQL Server 2008(100) 在 SSMS 中使用 SQL

Answer 1

像這樣的東西

update tablename from tablename
set depreciation = x.depreciation, 
    profile = x.profile, 
    description = x.description 
inner join tablename x on x.version = '2019OP' 
     and tablename.account = x.account 
     and tablename .workorder = x.workorder

Answer 2

您沒有指定 RDBMS。 在 Sql Server 中，這應該可以工作...

UPDATE x1 
SET x1.depreciation = x.depreciation, 
    x1.profile = x.profile, 
    x1.description = x.description 
FROM tablename x1
INNER JOIN tablename x ON x1.account = x.account AND x1.workorder = x.workorder
WHERE x1.version = '2019OP' 
     AND x.version = '2018OP' AND x.batch = ''

Answer 3

    update tn set tn.depreciation = ly.depreciation, tn.profile = ly.profile, tn.description = ly.description
    FROM tablename  as tn INNER JOIN 
    (
     SELECT 
        account ,
        workorder,
       depreciation,
       profile ,
      description 
     FROM tablename AS  
     where version = '2018OP'  and batch = ''
     ) AS ly  ON ly.account  = tn.account   AND  ly.workorder  = tn.workorder    
     tn.version = '2019OP'