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 of the advantages of a parallel database is ...
One characteristics of a dirty mouse is that the mouse ...
During presentation, slide transition can be activated by ...
Use Table 1 to answer the following question. Table 1: TableStudent Reg No ...
Which of the following database operations does not require a Data Maniulation Language? ...
Precautionary measures on computer do not include ...
One responsible way of using the computer is ...
The following feature are found in the toolbox of CorelDraw application except ...