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It sounds like you are wanting to set up the database such that people can input data. If so, they should not really be inputting directly into a table. There should be an input form that checks the data before adding it to the data table. That form could also enforce any required fields.
It sounds like you are wanting to set up the database such that people can input data. If so, they should not really be inputting directly into a table. There should be an input form that checks the data before adding it to the data table. That form could also enforce any required fields.