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Restrictions on the data values an attribute can have are called:

AConstraints
BConstructs
CContractions
DContributions
Answer & Solution
Correct answer: A. Constraints
1. Not every value should be allowed in every column. 2. The rules that limit them are named. 3. Constraints are restrictions on the data values that an attribute can have. 4. So the answer is constraints. _Source: syllabus Computer Science, Ch 9 'Structured Query Language (SQL)'_
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