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如何在WHERE子句中使用Distinct

sql-server sql

-1

Doonie Darkoo · 技术社区 · 6 年前

SELECT DISTINCT 
    COUNT([Attendance].[Status])
FROM
    [HRM].[tbl_EmployeeAttendance] [Attendance], [HRM].[tbl_EmployeeInfo] [Info]
WHERE 
    [Attendance].[Status] IN ('Early Left', 'Present', 'Half Day', 'Late In')
    AND [Info].[ID] = [Attendance].[EmpCode] 
    AND [Attendance].[EmpCode] = 266 
    AND CAST([Attendance].[AttendanceTimeIn] AS DATE) >= '2018-08-01' 
    AND CAST([Attendance].[AttendanceTimeOut] AS DATE) <= '2018-08-15'

现在有很多员工在一次约会中两到三次被标上出勤率。就像一个员工一旦离开,他的出勤率就会被安排为out,而一旦他来了,出勤率就会被安排为timein。因此,现在算起来,它是增加同一天的出席人数多次。我想在两个日期之间找出不同的日期。

以下是示例数据:

2018-04-04 18:12:30  2018-04-04 19:38:12   266  Present
2018-04-04 09:43:01  2018-04-04 09:58:41   266  Present
2018-04-05 16:40:52  2018-04-05 18:40:52   266  Present
2018-04-06 11:35:59  2018-04-06 11:48:49   266  Present

现在它两次计算日期4,但应该一次计算。

2 回复 | 直到 6 年前

Richard Hubley 6 年前

试着用这个来铸造日期和执行不同的

SELECT COUNT(DISTINCT CAST([Attendance].[AttendanceTimeIn] as Date))
FROM [HRM].[tbl_EmployeeAttendance] [Attendance], [HRM].[tbl_EmployeeInfo] [Info]
WHERE [Attendance].[Status] IN ('Early Left', 'Present', 'Half Day', 'Late In')
AND [Info].[ID] = [Attendance].[EmpCode] AND [Attendance].[EmpCode] = 266 
AND CAST([Attendance].[AttendanceTimeIn] AS DATE) >= '2018-08-01' 
AND CAST([Attendance].[AttendanceTimeOut] AS DATE) <= '2018-08-15'

Yogesh Sharma 6 年前

DISTINCT COUNT()

所以,应该是:

SELECT COUNT(DISTINCT [Attendance].[Status]), 
       COUNT(DISTINCT CAST([Attendance].[AttendanceTimeIn] AS Date))
. . .

不过,我建议使用适当的标准,明确 JOIN FROM 条款:

SELECT COUNT(DISTINCT [Attendance].[Status]),
       COUNT(DISTINCT CAST([Attendance].[AttendanceTimeIn] AS Date))
FROM [HRM].[tbl_EmployeeAttendance] [Attendance] INNER JOIN
     [HRM].[tbl_EmployeeInfo] [Info]
     ON [Info].[ID] = [Attendance].[EmpCode] 
WHERE [Attendance].[Status] IN ('Early Left', 'Present', 'Half Day', 'Late In') AND 
      [Attendance].[EmpCode] = 266 AND 
      CAST([Attendance].[AttendanceTimeIn] AS DATE) >= '2018-08-01'AND 
      CAST([Attendance].[AttendanceTimeOut] AS DATE) <= '2018-08-15'

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