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.
One characteristics of a dirty mouse is that the mouse ...
Who developed the first digital electrical computer? ...
The type of network which has a restricted coverage within an enterprise is called ...
To send an e-mail, the user must click on the part labelled ...
A type of file organization that stores data in the order of their arrival is called ...