I am new to Tersus and is studying on data manipulation.
I wonder how to create a database and input rule so that to avoid data duplication. For example, I want to create a table named: Category with id, code, name fields. id is primary key. code should not be duplicated.
I searched various application and in tutorial but could not find how to define no duplication rule for a field.
Could you show me how or any example so that I can study by myself.
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