SQL Server trigger to Prevent Duplicate Entries from my TimeLog Table -

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i have timelog table took entries of employees in , out

but due magnetic card reader machine take multiple entries of duplicate data

the difference in entries few seconds (which might goes different minutes)

unique identifiers:

  • uid = user id
  • type = in / out
  • serial = card reader number
  • checktime = time difference need check till 1 minute before

my trigger: 

create trigger [dbo].[data_checkout]  on [dbo].[tblname] after insert    if exists (select *                [dbo].[tblname] t                inner join inserted on datepart(day, t.checktime) = datepart(day,i.checktime)                                     , datepart(month, t.checktime) = datepart(month, i.checktime)                                      , datepart(hour, t.checktime) = datepart(hour, i.checktime)                                      , datepart(minute, t.checktime) = datepart(minute, i.checktime)                                       , datepart(minute, t.checktime) = datepart(minute, dateadd(minute, -1, i.checktime))                                      , t.[uid] = i.[uid]                                      , t.[type] = i.[type]                                      , t.[serial] = i.[serial])    begin       rollback       raiserror ('duplicate data', 16, 1);    end go


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