Which of the following statements is false with respect to relational – McqOptions

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1.	Which of the following statements is false with respect to relational DBMSrelational DBMS ?
A.	Foreign key constraints are referential integrity constraints.
B.	Nulls reduce space requirements in tables.
C.	A primary key uniquely identifies a row in a table.
D.	A disadvantage of highly normalized tables is that queries may require too many time consuming joins.
Answer» C. A primary key uniquely identifies a row in a table.

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