Question

A ________ key is a column or a set of columns that uniquely identifies each row in the table. Fill in the blank.

Answer 1

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Answer 2

A primary key is a column or a set of columns that uniquely identifies each row in the table.

• A table can have a specified number of columns but the rows present are many.
• We require more than one value to identify each row of a subset of a column.
• There is a specific kind of column present to identify specific rows called primary keys.
• Primary keys should only contain unique values, not null values.
• A particular table can have only one primary key consisting of singular or multiple columns.