条件查询表达式

Question

我在Access Query中有以下SQL。但我需要在表达式“Lasted”中添加一个条件。

SELECT ErrorLog.Reported_Date, ErrorLog.Details, ErrorLog.Started_At, ErrorLog.Ended_At,      ErrorLog.Project_Name, ([ended_at]-[started_at]) AS Lasted, ErrorLog.Not_Count_For_Pro_Time
FROM ErrorLog
GROUP BY ErrorLog.Reported_Date, ErrorLog.Details, ErrorLog.Started_At, ErrorLog.Ended_At,     ErrorLog.Project_Name, ([ended_at]-[started_at]), ErrorLog.Not_Count_For_Pro_Time;

此查询用作报告的记录源。现在，表达式包含“（[ended_at] - [started_at]）”的值。但是当我检查“Not_Count_For_Pro_Time”/ True时，我需要找到一种方法来显示“持续”0。

我在下面尝试过这段代码，但它只显示“Not_Count_for_Pro_Time”为假的记录。我希望报告显示所有记录，无论“Not_Count_For_Pro_Time”是真还是假，但表达式“Lasted”应如前所述进行调整。

SELECT ErrorLog.Reported_Date, ErrorLog.Details, ErrorLog.Started_At, ErrorLog.Ended_At,     ErrorLog.Project_Name, ([ended_at]-[started_at]) AS Lasted, ErrorLog.Not_Count_For_Pro_Time
    FROM ErrorLog
    GROUP BY ErrorLog.Reported_Date, ErrorLog.Details, ErrorLog.Started_At, ErrorLog.Ended_At,     ErrorLog.Project_Name, ([ended_at]-[started_at]), ErrorLog.Not_Count_For_Pro_Time
    HAVING (((ErrorLog.Not_Count_For_Pro_Time)=False));

Answer 1

使用条件逻辑：

IIF(ErrorLog.Not_Count_For_Pro_Time = 'true', 0, [ended_at]-[started_at]) AS Lasted,