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Question
Which of the following fields in a student file can be used as a Primary Key?
Which of the following fields in a student file can be used as a Primary Key?
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Solution
The correct option is B Social Security Number
Fields in a student
file can be used as a primary key is social security number.
A primary key is a
special relational database table column designated to uniquely
identify all table records. A primary key's main
features are: It must contain a unique value for each row of data. It cannot
contain null values.
The main purpose of a
primary key is to implement a relationship between two tables in a relational database. A
primary key is either an existing table column or a column that is specifically
generated by the database according to a defined sequence.
Fields in a student file can be used as a primary key is social security number.
A primary key is a special relational database table column designated to uniquely identify all table records. A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null values.
The main purpose of a primary key is to implement a relationship between two tables in a relational database. A primary key is either an existing table column or a column that is specifically generated by the database according to a defined sequence.
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