Question

我需要帮助来实施员工出勤表。目前正在招聘员工，即

查询：

SELECT c.First_name + c.Middle_name + c.last_name AS employeename,
       b.Device_Person_id,a.Dept_Id,Date1, 
       CASE WHEN b.Device_Person_id IS NOT NULL 
            THEN 'P' 
            ELSE 'A' END AS status
FROM Emp_setting a 
  LEFT OUTER JOIN (SELECT Device_Person_id, MAX(logDateTime) AS Date1 
                 FROM tempDeviceLogs 
                 GROUP BY Device_Person_id) b
    ON a.personal_id = b.Device_Person_id 
  LEFT OUTER JOIN persons_profile c 
    ON c.pesonal_id=a.personal_id

结果：

employeename      Device_person_id      dept_id      date1                status

MEHABOOB             NULL                 4         NULL                    A
UDAY                 NULL                 26    NULL                        A  
SHANKRAYYA           NULL                 10    NULL                        A
BASAVARAJ            NULL                 24    NULL                        A
BHIMAPPA              5                   10       2014-05-23 14:14:00.000      P

即。 Employeename BHIMAPPA出现在2014-05-23。

现在我想要出席2014-05-23的员工名单。

请帮帮忙？

Answer 1

假设logDateTime表示员工的存在，并且假设当前派生表返回此字段的MAX()（可能是最后一次检测到员工），则需要另一个联接要进行过滤的tempDeviceLogs表。您可以使用INNER JOIN同时进行过滤，即：

...
INNER JOIN (SELECT Device_Person_id 
            FROM tempDeviceLogs 
            WHERE logDateTime >= '2014-05-23' and logDateTime < '2014-05-24') x
   ON x.Device_Person_id = a.personal_id

修改
鉴于您想要SELECT日期，我假设您要对其进行参数化/将其用于范围。关于你的SqlServer版本是＆gt; = 2008的另一个假设，将DateTime投射到Date并按其分组：

SELECT c.First_name + c.Middle_name + c.last_name AS employeename, b.Device_Person_id,a.Dept_Id, Date1 as DateTimeLastSeen, x.logDate As DatePresent, CASE WHEN b.Device_Person_id IS NOT NULL THEN 'P' ELSE 'A' END AS status FROM Emp_setting a LEFT OUTER JOIN (SELECT Device_Person_id, MAX(logDateTime) AS Date1 FROM tempDeviceLogs GROUP BY Device_Person_id) b ON a.personal_id = b.Device_Person_id LEFT OUTER JOIN persons_profile c ON c.pesonal_id=a.personal_id INNER JOIN (SELECT Device_Person_id, CAST(logDateTime AS DATE) as logDate FROM tempDeviceLogs GROUP BY Device_Person_id, CAST(logDateTime AS DATE)) x ON x.Device_Person_id = a.personal_id WHERE logDate BETWEEN '2014-05-01' AND '2014-05-23';

这也可以通过DISTINCT完成。如果您有早期版本的SqlServer，请使用hack like this获取DateTime的日期部分（在select +组中）

Answer 2

创建一个变量来保存您要查找的日期。

DECLARE @cutOffDate DATE
SET @cutOffDate = '23-05-2014'

然后添加到您的陈述的末尾

Where Date1 = @cutOffDate

如何确定员工出勤数据的两个不同的聚合日期？

2 个答案: