Question

我有这行代码

select min(A.id) 'id',
      CONVERT (VARCHAR(10),min(A.date_in),101) as 'Date_in',
      CONVERT (VARCHAR(10),min(A.date_in),108) as 'Time_in',
      CONVERT (VARCHAR(10),min(A.date_out),101) as 'Date_out',
      CONVERT (VARCHAR(10),min(A.date_out),108) as 'Time_out',
      min(B.firstname) 'firstname',min(B.lastname) 'lastname', 
      min(A.ip_address) 'ip_address',
      CASE min(B.UserType)
        WHEN 1029 THEN 'Administator'
        WHEN 1030 THEN 'Casheiring'
        WHEN 1031 THEN 'Front Office'
        WHEN 1032 THEN 'Housekeeping'
        WHEN 1033 THEN 'POS'
END as 'user_type'
from AEmployeeLogs A 
LEFT JOIN AUsers B on B.id = A.[user_id]
group by A.[user_id]
ORDER BY min(A.id) DESC

在这个查询中，我得到了这个：

 id   Date_in     Time_In   Date Out     Time_Out   firstname  lastname  ip_address      user_type
 5    10/05/2017  15:14:59  10/05/2017   20:20:37   LeBron     James     192.168.0.1     Administrator
 1    10/04/2017  12:04:32  10/05/2017   16:02:53   Kevin      Durant    192.168.0.2     Administrator

这些将为我提供我分组的2个ID我想要在每个日期都应该在那里每次我希望它像这样：

  id   Date_in     Time_In   Date Out     Time_Out   firstname  lastname  ip_address      user_type
  5    10/05/2017  15:14:59  10/05/2017   20:20:37   LeBron     James     192.168.0.1     Administrator
  3    10/05/2017  11:58:20  10/05/2017   16:02:53   Kevin      Durant    192.168.0.2     Administrator
  1    10/04/2017  12:04:32  10/05/2017   16:02:53   Kevin      Durant    192.168.0.2     Administrator

它应该有这个输出我只想在每个日期得到min（）而不是整个表的min（），即使是group by子句请帮帮我，谢谢：）

Answer 1

我想你想要这样的东西。

select *
from
(
    select A.id,
        CONVERT (VARCHAR(10), A.date_in,101) as 'Date_in',
        CONVERT (VARCHAR(10), A.date_in,108) as 'Time_in',
        CONVERT (VARCHAR(10), A.date_out,101) as 'Date_out',
        CONVERT (VARCHAR(10), A.date_out,108) as 'Time_out',
        B.firstname,
        B.lastname,
        A.ip_address,
        CASE B.UserType
            WHEN 1029 THEN 'Administator'
            WHEN 1030 THEN 'Casheiring'
            WHEN 1031 THEN 'Front Office'
            WHEN 1032 THEN 'Housekeeping'
            WHEN 1033 THEN 'POS'
        END as 'user_type'
        , RowNum = ROW_NUMBER() over(partition by A.id, A.date_in order by A.date_in)
    from AEmployeeLogs A 
    LEFT JOIN AUsers B on B.id = A.[user_id]
) x
where x.RowNum = 1
ORDER BY x.id DESC

此外，您应该使用比A，B，C等更好的别名。这是一个不好的习惯。

Bad habits to kick : using table aliases like (a, b, c) or (t1, t2, t3)

SQL Server组与日期差异

1 个答案: