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multi-field unique key

vantis
in Calculation Engine (Define Fields)

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Is there any way to have two fields combined to create a unique record. I have a timesheet database. The fields I would like to have unique are employee_id and time_start_date. I d not need a many:many realtionship. I just need to make sure that no one employee can be associated to the same week more than once. Both fields are in the same database. Any suggestion on implemneting a combo key? I tried creating a calculation but I am not sure if you can apply uniqueness to the calc.

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https://fmforums.com/topic/3006-multi-field-unique-key/
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