sql - 如何找到一天中的第一次和最后一次时间

Question

我有一个查询，它获取部门中第一个打卡的人和最后打卡的部门的人。从本质上讲，这向我展示了谁打开了一个位置，谁关闭了一个位置。下面是我使用“OVER”函数的查询，但是 over 函数不适用于 VB.net 中的数据集是否有任何其他选项可以替换 over 函数？

SELECT * FROM (
    SELECT timeclock.dtTimeIn, timeclock.dtTimeOut, employees.sfirstname,
       RANK() OVER ( ORDER BY dtTimeIn) rk1, --earliest record gets 1
       RANK() OVER (ORDER BY dtTimeOut DESC) rk2 --latest record gets 1

    FROM   TimeClock INNER JOIN
                         Employees ON TimeClock.lEmployeeID = Employees.lEmployeeID
    WHERE (dtTimeIn > dateadd(day, datediff(day, 0, getdate())-1, 0)) AND (dtTimeOut < dateadd(day, datediff(day, 0, getdate()), 0)) AND 
      (sDept IN ('1', '2', '3'))
) A
WHERE rk2=1 

Answer 1

你可以试试这个:

SELECT  tc.dtTimeIn
        , tc.dtTimeOut
        , e.sfirstname
FROM    TimeClock tc
JOIN    Employees e ON tc.lEmployeeID = e.lEmployeeID
JOIN    (               
            SELECT  DATEADD(DAY, DATEDIFF(DAY, 0, tc.dtTimeIn), 0) _date
                    , MIN(tc.dtTimeIn) dtTimeIn
                    , MAX(tc.dtTimeOut) dtTimeOut
            FROM    TimeClock tc
            WHERE   e.sDept IN ('1', '2', '3')
            GROUP BY
                    DATEADD(DAY, DATEDIFF(DAY, 0, tc.dtTimeIn), 0)
) t ON  t._date = DATEADD(DAY, DATEDIFF(DAY, 0, GETDATE()), 0)
AND     DATEADD(DAY, DATEDIFF(DAY, 0, tc.dtTimeIn), 0) = t._date
AND     (t.dtTimeIn = tc.dtTimeIn OR t.dtTimeOut = tc.dtTimeOut)
WHERE   e.sDept IN ('1', '2', '3')