Use Table 1 to answer the following ques...
Use Table 1 to answer the following question.
Table 1: TableStudent
| Reg No | House |
Age |
| 18/001 | Yellow | 14 |
| 18/002 | Blue | 15 |
| 18/003 | Yellow | 15 |
Columns 2 and 3 in Table 1 cannot be used as primary key because both fields contain
Different datatypes
Duplicate values
The same datatype
Only strings and numbers respectively
Correct answer is B
Columns 2 and 3 in Table 1 cannot be used as a primary key because both fields contain duplicate values.
A primary key is a unique identifier for each record in a database table. It ensures that each record has a distinct value, allowing for efficient data retrieval and maintaining data integrity. In the given TableStudent, the "House" column (Column 2) and the "Age" column (Column 3) both contain duplicate values. For example, the House column has two records with the value "Yellow" and the Age column has two records with the value "15". Since a primary key must have unique values, neither of these columns can be used as the primary key.
The manipulation of digitised information by computer or other digital electronic equipment is ...
An entrepreneur who wishes to send digital data over a telephone line would need a ...
The rules for exchanging data on a network are known as ...
Which of these operations would not improve the performance of a parallel database system? ...
A program designed to detect and prevent malicious programs from a computer system is ...
A special effect that controls the way slides appear in PowerPoint presentation is called ...
The allocation and de-allocation of computing resources in a computer is the function of ...