BUSINESS ADMINISTRATION
COMPUTER APPLICATION IN BUSINESS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Primary key attribute(s) will accept only ____ values
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redundant
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integer
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unique
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character
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Explanation:
Detailed explanation-1: -Primary keys must contain UNIQUE values, and cannot contain NULL values. A table can have only ONE primary key; and in the table, this primary key can consist of single or multiple columns (fields).
Detailed explanation-2: -If the counts in this query match, the primary key is unique. If the counts do not match, the primary key is not unique and appears in multiple rows.
Detailed explanation-3: -This unique standard attribute is called a primary-key attribute. The primary-key attribute and a value assigned to a record becomes the primary key of the record. Every record added to the data store must have a primary key. The primary-key attribute type can be of any supported Dgraph property types.
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