來自SELECT CASE的關鍵字丟失

我不確定這個case語句序列有什麼問題。我已經在網上看，語法似乎是正確的，但我得到錯誤缺少關鍵字。任何幫助將不勝感激！來自SELECT CASE的關鍵字丟失

CASE 
when A = '1' then 
     when sequence_number = 5 then 9 
     when sequence_number = 6 then 9 
     end 
when A = '2' then 
     when sequence_number = 5 then 9 
     when sequence_number = 6 then 9 
     end 
    when A = '3' then 
     when sequence_number =7 then 9 
     when sequence_number =8 then 9 
     end 
else T.number 
end as number

來源

2013-03-12 alloemf

你需要在相關的條款的情況下額外的「案例」？即當A ='1'的情況下，那麼* case *當sequence_number ...等 – Mikeb 2013-03-12 20:35:38

用保留字（'number'）混淆列可能不是一個好主意。 – 2013-03-13 02:52:38

最簡單的方法似乎是：

case 
    when (A in (1,2) and sequence_number in (5,6)) or 
     (A in (3 ) and sequence_number in (7,8)) 
    then 9 
    else t.number 
end

來源

2013-03-12 22:56:11

你要麼需要第二個CASE語句中的每個分支內，或者你需要的條件

CASE 
when A = '1' and sequence_number = 5 then 9 
when A = '1' and sequence_number = 6 then 9 
when A = '2' and sequence_number = 5 then 9 
... 
else T.number 
end as number

或

CASE 
when A = '1' then 
     case when sequence_number = 5 then 9 
       when sequence_number = 6 then 9 
     end 
when A = '2' then 
     case when sequence_number = 5 then 9 
      when sequence_number = 6 then 9 
     end 
when A = '3' then 
     case when sequence_number =7 then 9 
      when sequence_number =8 then 9 
     end 
else T.number 
end as number

來源

2013-03-12 20:40:29

@mikeb是正確的組合 - 你需要一個額外的案件。

我在測試這個時也遇到了Number列的問題;只是猜測，但也許甲骨文作爲保留字窒息它？如果你像我一樣得到ORA-01747: invalid user.table.column, table.column, or column specification異常，那麼將其更改爲Num或TheNumber。

下面是更新CASE：

CASE 
when A = '1' then 
     case 
     when sequence_number = 5 then 9 
     when sequence_number = 6 then 9 
     end 
when A = '2' then 
     case 
     when sequence_number = 5 then 9 
     when sequence_number = 6 then 9 
     end 
when A = '3' then 
     case 
     when sequence_number =7 then 9 
     when sequence_number =8 then 9 
     end 
else T.number 
end as number

來源

2013-03-12 20:42:25

來自SELECT CASE的關鍵字丟失

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