使用子查詢進行更新會出錯：「多部分標識符無法綁定。」 （Sql Server 2008）

Question

我試圖更新表中的一組記錄與另一組記錄在同一個表中的值。當我運行此查詢，我得到錯誤：

Msg 4104, Level 16, State 1, Line 1
The multi-part identifier "t.com" could not be bound.

代碼：

update tphase 
set 
    t.com = t.com + b.com, 
    t.direct = t.direct + b.direct, 
    t.fee = t.fee + b.fee, 
    t.fringe = t.fringe + b.fringe, 
    t.fte = t.fte + b.fte, 
    t.ganda = t.ganda + b.ganda, 
    t.hours = t.hours + b.hours, 
    t.overhead = t.overhead + b.overhead, 
    t.fccmga = t.fccmga + b.fccmga, 
    t.fccmoh = t.fccmoh + b.fccmoh, 
    t.lbroh = t.lbroh + b.lbroh, 
    t.ms = t.ms + b.ms 
from 
    tphase t 
inner join 
    (select * 
    from tphase 
    where program = 'xenon' and 
      class = 'earned' and 
      df_date > '2013-05-03'   
    ) as b on t.program = b.program and 
      t.cawpid = b.cawpid and 
      t.class = b.class and 
      t.cecode = b.cecode 
where 
    t.program = 'xenon' and 
    t.class = 'earned' and 
    t.df_date = '2013-05-03' ; 

Answer 1

此錯誤是告訴你，沒有在tphase表命名com列。您將需要刪除該引用，或將其更改爲正確的列名稱。

Answer 2

如果你給tphase別名T，你需要引用別名更新語句，也

UPDATE t 
set 
    t.com = t.com + b.com, 
...