Datediff可以导致我无法在SQL中执行我的语句？

Question

示例数据：

表员工：

EMPL_KODE | EMPL_NAME |SEX    |SECTION
001       | Michel    |Male   |HR
002       | Clara     |Female |GA
003       | Rafael    |Male   |HR

表出勤：

EMPL_KODE | EMPL_NAME |DATE_IN    |TIME_IN |TIME_OUT
001       | Michel    |25.04.2016 |06:50   |15:40
002       | Clara     |25.04.2016 |06:15   |15:43
003       | Rafael    |25.04.2016 |06:25   |15:45
001       | Michel    |26.04.2016 |06:23   |15:42
002       | Clara     |26.04.2016 |06:10   |15:41
003       | Rafael    |26.04.2016 |06:30   |15:42
001       | Michel    |27.04.2016 |06:33   |15:42
002       | Clara     |27.04.2016 |06:54   |15:44
003       | Rafael    |27.04.2016 |07:00   |15:45

从这两个表中，我想：

1. 加入employee和attendance表格

2. 显示每个Empl_Kode

的总分钟数或小时数

我希望输出如下：

EMPL_KODE | EMPL_NAME | TIME_IN | TIME_OUT | TOTAL_MINUTES | TOTAL_HOURS

SQL代码：

SELECT 
    EMPLOYEE.EMPL_KODE, EMPLOYEE.EMPL_NAME,
    CAST(ATTANDANCE.DATE_IN + ATTANDANCE.TIME_IN AS TIMESTAMP) AS   "TIME_IN", 
    CAST(ATTENDANCE.DATE_IN + ATTENDANCE.TIME_OUT AS TIMESTAMP) AS "TIME_OUT", 
    SUM(DATEDIFF(MINUTE, ATTENDANCE.TIME_IN, ATTENDANCE.TIME_OUT)) AS "TOTAL_MINUTES",
    SUM(DATEDIFF(HOUR, ATTENDANCE.TIME_IN, ATTENDANCE.TIME_OUT)) AS "TOTAL_HOURS"
FROM 
    EMPLOYEE
JOIN 
    ATTENDANCE ON EMPLOYEE.EMPL_KODE = ATTENDANCE.EMPL_KODE
GROUP BY 
    EMPLOYEE.EMPL_KODE, EMPLOYEE.EMPL_NAME;

我收到错误消息：

  

选择列表中的表达式无效（不包含在   聚合函数或GROUP BY子句）

我的代码出了什么问题？你能帮帮我吗？

Answer 1

试试这个：

SELECT 
   EMPLOYEE.EMPL_KODE, 
   EMPLOYEE.EMPL_NAME,
   MIN(CAST(ATTANDANCE.DATE_IN + ATTANDANCE.TIME_IN AS TIMESTAMP)) AS "TIME_IN", 
   MAX(CAST(ATTANDANCE.DATE_IN + ATTANDANCE.TIME_OUT AS TIMESTAMP)) AS "TIME_OUT",
   SUM(DATEDIFF(MINUTE,ATTANDANCE.TIME_IN,ATTANDANCE.TIME_OUT)) AS "TOTAL_MINUTES",
   SUM(DATEDIFF(HOUR,ATTANDANCE.TIME_IN,ATTANDANCE.TIME_OUT)) AS "TOTAL_HOURS"
FROM EMPLOYEE
JOIN ATTANDANCE
     ON EMPLOYEE.EMPL_KODE=ATTANDANCE.EMPL_KODE
GROUP BY EMPLOYEE.EMPL_KODE, EMPLOYEE.EMPL_KODE;