Computer Science · Database Management Systems
In a database table with a composite primary key (A, B), which of the following scenarios violates the entity integrity constraint?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1All rows having non-null, unique combinations
- 2A row with A = 2, B = 4
- 3A row with A = 1, B = 2
- 4A row with A = NULL, B = 3✓
Correct answer
A row with A = NULL, B = 3
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