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Attribute setup
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| · | Not NULL constraint, no default value: If the operation type is insert, you will be forced to choose an action.
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| · | Unique columns: You can only choose to insert a respondent attribute. Other actions will not generate unique values, so they are disabled.
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| · | Primary keys: You cannot change the primary key of a table when the update operation is used. If the primary key is automatically generated for new rows, you cannot specify an action for the insert operation. If the primary key is not automatically generated, you must choose an action. Since primary keys need to be unique, you can only choose to insert a respondent attribute as the primary key.
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