What is the importance of the …
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Posted by Jaikesh Singh 4 years, 9 months ago
- 4 answers
Gaurav Seth 4 years, 9 months ago
A primary key is a set of one or more attributes that can uniquely identify tuples within the relation.
For example, in the following table ITEM, the column Ino can uniquely identify each row in the table, hence Ino is the primary key of the following table.
| Ino | Item | Quantity |
| 1 | Pen | 220 |
| 2 | CD | 530 |
| 3 | DVD | 450 |
| 4 | Duster | 110 |
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Krishna Padhy 4 years, 9 months ago
0Thank You