Sql 如何为聚合添加Case语句

我有一个查询，可以获取时钟和中断时间异常。如果有人不休息，休息时间是负数。我需要报告“休息时间”，但是我需要将负休息时间更改为“0”，否则报告休息时间

我的问题是：

SELECT lEmployeeID, sFirstName, sLastName, 
       TotalHours, BreakTime, SkippedBreak, ShortBreak
FROM (
    SELECT lEmployeeID, sFirstName, sLastName, 
        SUM(TotalHours) AS TotalHours, 
        DATEDIFF(mi, MIN(dtTimeOut), MAX(dtTimeIn)) AS BreakTime, 
        CASE WHEN SUM(ftc.TotalHours) > 6 
              AND DATEDIFF(mi, MIN(ftc.dtTimeOut), MAX(ftc.dtTimeIn)) < 0 
             THEN 1 
             ELSE 0 
        END AS SkippedBreak, 
        CASE WHEN DATEDIFF(mi, MIN(ftc.dtTimeOut), MAX(ftc.dtTimeIn)) < 30 
              AND DATEDIFF(mi, MIN(ftc.dtTimeOut), MAX(ftc.dtTimeIn)) > 0 
             THEN 1 
             ELSE 0 
        END AS ShortBreak
    FROM dbo.fTimeCard(@StartDate, @EndDate, @DeptList, 
                       @iActive, @EmployeeList) AS ftc
    WHERE (DID IS NOT NULL) 
       OR (DID IS NOT NULL) 
      AND (dtTimeOut IS NULL)
    GROUP BY lEmployeeID, sFirstName, sLastName
) AS sub
WHERE (SkippedBreak = 1) 
   OR (ShortBreak = 1)

---

我需要负的中断时间分钟数为“0”

将您的查询包装在外部查询中，该查询使用

大小写来处理负聚合值：

SELECT
    lEmployeeID, sFirstName, sLastName, TotalHours, 
    CASE WHEN BreakTime < 0 THEN 0 ELSE BreakTime END AS BreakTime,
    SkippedBreak, ShortBreak
FROM (
    <your current query>
) t

选择
lEmployeeID、sFirstName、sLastName、TotalHours、，
当中断时间小于0时，则为0，否则中断时间结束为中断时间，
短跑
从(
)t
可能重复的问题源自我对上一个问题的发现。这是另一个问题。我现在正在尝试更改“中断时间”的结果，如果它小于0，那么如果您为您要查找的查询提供一个简单的
输入
数据和相应的
输出
数据（结果），就会容易得多。
SELECT
    lEmployeeID, sFirstName, sLastName, TotalHours, 
    CASE WHEN BreakTime < 0 THEN 0 ELSE BreakTime END AS BreakTime,
    SkippedBreak, ShortBreak
FROM (
    <your current query>
) t