What is a composite key?Group of answer choicesA key that consists of two or more attributes.A key that is used to enforce foreign key constraints.A key that can have NULL values.A key consisting of a single attribute.
Question
What is a composite key?Group of answer choicesA key that consists of two or more attributes.A key that is used to enforce foreign key constraints.A key that can have NULL values.A key consisting of a single attribute.
Solution
A composite key is a key that consists of two or more attributes. It is used to uniquely identify a record in a table when a primary key is not available. This means that the combination of these two or more attributes will be unique across the table.
Similar Questions
What is a candidate key?Group of answer choicesA super key with no redundant attributes.A key that can have duplicate values.A key that is always used as a primary key.A key that contains a composite of two or more foreign keys.
A composite key is used when _____________*1 pointmore than one key is needed to identify a recordit is difficult to identify a primary keymore than two keys are needed to identify a recordit is difficult to identify a secondary key
A relation is in ____________ if an attribute of a composite key is dependent on an attribute of other composite key.
What is a composite attribute?
.A primary key which is imported from another table is called a foreign key.b.Foreign key is essential for each tuple.c.Composite attribute can not divide to sub partsd.In a formal relational model data are stored in tables.e.Age is derived by date of birth attribute
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