KwickClips Databases and SQL · 44 sec · free
A table has 3 columns and 4 rows. What is the cardinality?
Short answer. 4.
Does the heading count as a tuple?
No.
Count with me
| Columns: 1, 2, 3 |
| Degree = 3 |
| Rows: 1, 2, 3, 4 |
| Cardinality = 4 |
Remember
| Degree: columns |
| Cardinality: rows |
| Never count the heading |
Which one counts rows, degree or cardinality? Count columns: one, two, three. Degree is three. Count rows: one, two, three, four. Cardinality is four. Degree counts columns. Cardinality counts rows. Never count the heading.
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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