更改SQL查詢中的返回值

Question

我正在使用實時查看程序來進行SQL查詢（並讓我編輯代碼的一部分）

目前代碼是：

SELECT 
    [LogonName] AS [Logon name], 
    [LogonExtension] AS [Logon extension], 
    [VoiceReady] AS [Ready for Voice], 
    [CallState] AS [Call state]
FROM 
    [AgentPerformance]
WHERE 
    (AgentID IN (1, 2, 3))

返回：

現在我的問題是，有沒有辦法改變返回的“呼叫狀態”值，讓我們說忙，免費，處理等...（有3個不同的值）。

我試過例如：

SELECT 
    [LogonName] AS [Logon name], 
    [LogonExtension] AS [Logon extension], 
    [VoiceReady] AS [Ready for Voice], 
    [CallState] AS [Call state]
FROM
    [AgentPerformance]
WHERE 
    (AgentID IN (1, 2, 3))

SELECT 
    CASE 
       WHEN CallState = 0 THEN 'No'
       WHEN CallState = 1 THEN 'Yes
       ELSE 'Maybe'
    END AS kakaduu
FROM 
    AgentPerformance

但這對我不起作用。

Answer 1

您的CASE表達式需要與其他列一起位於SELECT列表中。 第二個SELECT在您的示例中是不正確的語法。

所以，試試這個：

SELECT [LogonName] AS [Logon name], [LogonExtension] AS [Logon extension], [VoiceReady] AS [Ready for Voice], [CallState] AS [Call state],
CASE 
    WHEN CallState = 0 then 'No'
    WHEN CallState = 1 then 'Yes'
    ELSE 'Maybe'
END
AS kakaduu
FROM [AgentPerformance]
WHERE   AgentID IN (1, 2, 3)