选择case语句时出错

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如何将此T-SQL查询转换为Oracle？选择case语句时出错

if((select case 
     when (select top 1 AlertMessage 
      from ims.dbo.alertlist 
      where [email protected] 
      order by TimePeriod desc 
      ) like '%NO_COMMUNICATION_Resolved' then 1 
     else 0 end)=1) 
begin 
    INSERT INTO [ims].[dbo].[alertlist] 
      ([SiteID],[ThresholdNumber],[SystemID], 
      [AlertMessage],[TimePeriod],[AlertType],[PollID]) 
    VALUES 
      (1,@thresnumber,@meter,@message,getdate(),1,0) 
end

来源

2012-08-07 Saranya Jothiprakasam

你有什么试过？当你把它放到Oracle中时你有错误吗？什么是错误？ – 2012-08-07 14:02:58

另外，您正在使用哪个版本的Oracle？ – Diego 2012-08-07 14:20:13

我使用oracle 11。 – 2012-08-07 14:29:57

正如Dan Puzey指出的那样，您的问题过于宽泛，需要大量的试验和错误。但是，我会尽力让你走上正确的轨道，并且可以解决问题的第一部分。

DECLARE v_IsMessageResolved int; 

-- This query will retrieve the value of the first row returned by the sub-query, mimicking the TOP 1 of SQL Server, and it will store the value of MessageResolved in a Variable 
SELECT 
    MessageResolved into v_IsMessageResolved 
FROM 
    (
    -- This query will return 1 for all the Messages that match the LIKE clause, ordered by TimePeriod in descending order. 
    SELECT 
    CASE 
     WHEN AlertMessage LIKE '%NO_COMMUNICATION_Resolved' THEN 1 
     ELSE 0 
    END AS MessageResolved 
    ,RANK() OVER (ORDER BY TimePeriod DESC) AS MessageRank 
    FROM 
    ims.alertlist 
    WHERE 
    (SystemID = :meter) 
) 
WHERE 
    (MessageRank = 1) 

-- At this point, it will be a matter of checking the value of v_IsMessageResolved and, if it's "1", run the INSERT

请注意，我知道SQL Server的非常好，但我从来没有使用甲骨文，所以我的解决方案可能不完美（甚至根本运行，因为我没有的环境中进行测试）。这也意味着您可以像我一样，通过简单的搜索找到您可能遇到的其他问题的答案。 :)

来源

2012-08-07 14:35:05 Diego

选择case语句时出错

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