Which of the following statements concerning the SQL PRIMARY KEY requirement is incorrect?
A. The PRIMARY KEY uniquely identifies each record in a SQL database table.
B. Multiple columns can be used to create a primary key.
C. The primary key must consist of a single column.
D. Primary keys must have UNIQUE values.
Answer:C
Which of the following statements concerning the SQL PRIMARY KEY requirement is incorrect?
A. The PRIMARY KEY uniquely identifies each record in a SQL database table. B. Multiple columns can be used to create a primary key. C. The primary key must consist of a single column. D. Primary keys must have UNIQUE values.
Explanation: A table's primary key might be based on a single column or a collection of columns.