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Thank you for your engaged answer! The chemical information could be connected with different dates- The table with years should be exchnaged to a datafield as you said. About the table with existence. I agree with you that I have not had a good idea about how to put in that information. Your...

Thank you for your engaged answer! The chemical information could be connected with different dates- The table with years should be exchnaged to a datafield as you said. About the table with existence. I agree with you that I have not had a good idea about how to put in that information. Your...

Hello, I am trying to build a database for animals in many lakes. The goal for the database is to be a base for creating overviewmaps where you can see which species exist or have existed in different lakes with specified properties. I imagine the structure of the database in this way: Table...