KwickClips Databases and SQL · 40 sec · free
What is the domain of marks out of 100?
Short answer. The whole numbers 0 to 100.
Is -4 a valid mark?
No. It is outside the domain.
Domain of Marks
| Value | Valid? |
|---|---|
| 87 | Yes |
| 150 | No |
| -4 | No |
Remember
| Domain: allowed values |
| Outside the domain: invalid |
Marks are out of one hundred. Can a student score one fifty? The domain is the set of allowed values. For marks, that is zero to one hundred. So one fifty is invalid. Domain means allowed values. Anything outside is invalid.
This clip is from the full lesson: The Relational Model: Relation, Tuple, Attribute, Domain, Degree and Cardinality — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 10 Information Technology (402), CBSE Class 12 Computer Science (083), CBSE Class 11 Informatics Practices (065), CBSE Class 11 Information Technology (802)
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