IBM
C2090-610 · Question #34
Which type of constraint can be used to ensure that an INTEGER column in a table will never be assigned more than one record that contains a NULL value?
The correct answer is A. Unique constraint. See the full explanation below for the reasoning.
Question
Which type of constraint can be used to ensure that an INTEGER column in a table will never be assigned more than one record that contains a NULL value?
Options
- AUnique constraint
- BPrimary key constraint
- CInformational constraint
- DColumn default constraint
How the community answered
(36 responses)- A81% (29)
- B11% (4)
- C6% (2)
- D3% (1)
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