Question

1. Give the terms for each of the following:
(1) DBMS creates a file that contains description about the data
stored in the database.
(ii) Attribute that can uniquely identify the tuples in a relation.
(iii) Special value that is stored when actual data value is
unknown for an attribute.
(iv) An attribute which can uniquely identify tuples of the table
but is not defined as primary key of the table.
(v) Collection of logically related records.​

Answer 1

Answer:

1) Keys are constraints and row is one whole set of attributes. ... For each attribute of a relation, there is a set of permitted values, called the ______ of ... But the id attribute has to be unique .

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