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NO.1 Which statements are correct regarding indexes? (Choose all that apply.)
A. Indexes should be created on columns that are frequently referenced as part of an expression.
B. For each DML operation performed, the corresponding indexes are automatically updated.
C. A non-deferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a unique
index.
D. When a table is dropped, the corresponding indexes are automatically dropped.
Answer: B,C,D
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NO.2 Which two statements are true regarding constraints? (Choose two.)
A. A constraint can be disabled even if the constraint column contains data.
B. A constraint is enforced only for the INSERT operation on a table.
C. All the constraints can be defined at the column level as well as the table level
D. A foreign key cannot contain NULL values.
E. A column with the UNIQUE constraint can contain NULL.
Answer: A,E
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