MySQL Script for find finding missing entry from a specific group and then enter the missing row on that group

I have one table ClockIn which is as follows:

12021-10-19 08:00:001481Start
22021-10-19 10:00:001481End
32021-10-19 11:00:001481Start
42021-10-19 08:00:001492Start
52021-10-19 17:00:001492End

The table is basically using for attendance of the employee. I need to write one SQL script which will find the employee who has any start but forgot to enter end time (Means he has no rows for Type=end, but has start. NB: One employee might have multiple Start and End in the same day).

First I need to figure out that employee and then I have to enter the missing End row for that employee. And the End TimeSpan will be StartTime + 8hrs.

I am using MySql DB, so I am trying to write a MySql script. Do I need to use any temporary table or procedure for this. I am totally stuck how to do that. Any help would be appreciate please.


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Method 1

Check with NOT EXISTS another record for same employee, same day, “End” timestamp is after the timestamp for “Start”

FROM ClockIn a
WHERE a.Type = 'Start'
  FROM ClockIn b
  WHERE b.EmployeeId = a.EmployeeId
  AND a.WorkDayId = b.WorkDayId
  AND a.Timestamp < b.Timestamp
  AND b.Type = 'End'

Examples in the above link also includes an INSERT statement for create the “End” record, but it is a question if it always add 8 hours from “Start”.

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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