Which two statements are true about constraints? (Choose two.)
A.The UNIQUE constraint does not permit a null value for the column.
B.A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints.
C.The PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index.
D.The NOT NULL constraint ensures that null values are not permitted for the column.
Answer:B
Which two statements are true about constraints? (Choose two.)
A.The UNIQUE constraint does not permit a null value for the column. B.A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints. C.The PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index. D.The NOT NULL constraint ensures that null values are not permitted for the column.