Which of the following is used to uniquely identify a record in a database table?
A
Primary Key
B
Index
C
Foreign Key
D
Query
Correct Answer: Option A — Primary Key
Explanation:
A primary key is a column or set of columns in a database table that uniquely identifies each record, ensuring no duplicate values exist. It...
A primary key is a column or set of columns in a database table that uniquely identifies each record, ensuring no duplicate values exist. It is essential for maintaining data integrity and establishing relationships between tables.