1z0-071 Exam Dumps | Which two are true about constraints?

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Question 131/156

Which two are true about constraints?

A. Constraints are enforced only during INSERT operations.

B. A column with a foreign key constraint can never contain a null value.

C. All constraints can be defined at the table or column level.

D. A constraint can be disabled even if the constrained column contains data.

E. A column with a UNIQUE constraint can contain a NULL value.

Correct Answer: D,E

A; False. Constraints are enforced during INSERT and UPDATE operations, and by the nature of their definition, they impact DELETE operations as well (in the case of referential constraints).
B: False. A column with a foreign key constraint can contain a NULL value unless it is also constrained to be NOT NULL.
C: False. Not all constraints can be defined at the column level. For example, some constraints such as FOREIGN KEY constraints are more commonly defined at the table level.
D: True. A constraint can be disabled regardless of whether the constrained column contains data. However, re-enabling the constraint requires that all data satisfy the constraint rules.
E; True. A column with a UNIQUE constraint can indeed contain a NULL value, as NULL is considered not equal to any value, including itself. This means that multiple rows with NULL values do not violate the UNIQUE constraint.
References:
* Oracle Documentation on Constraints:
https://docs.oracle.com/database/121/SQLRF/clauses002.htm#SQLRF52271
* Oracle Documentation on Enabling and Disabling Constraints:
https://docs.oracle.com/database/121/ADMIN/clustrct.htm#ADMIN13508

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