If i change the row is different can u gift me a good way? With condition Date=today() and the employee just can choice clock in and clock out one time? Because the problem now is the employee can choice clock in and clock out more than one time in o...

Clock in and clock out in same row, but the type is enum with value clock in and clock out recorded in one row

i have coloum enum and the value in coloum enum is clock in and clock out, how i can set condition in enum value if today the employees already filled clock in, and clock in can’t fill again in today?

how to create initial isblank or isnotblank for value in enum?