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What is a field that has a unique value for each record in a database?
Wiki User
∙ 11y ago
Primary key
Wiki User
∙ 11y ago
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What is a field that contains a unique value?
It can be referred to as a UNIQUE column. Such columns can be a:Primary KeyUnique Key orCandidate Keyin a database table
What are field can be used as primary key?
A field or set a of fields Êin a database tableÊwith unique values Êcan be used as a primary key.ÊPrimary key field cannot have a null value.
What is autonumber field in access?
Automatically stores a number that is one greater than the last number used. It is used to identify a record by acting as a Primary Key. A Primary Key is unique and cannot be left blank. Even if a number is deleted, that number will never be used again, ensuring that each record can be uniquely identified. You do not have to enter the value. It will automatically enter itself. You also cannot change it.
What is the value that the database uses for the field unless the user enters another value?
The value that a database uses for a field is set to a default value, usually by the database designer. The value can be whatever the company wants it to be, as long as it is valid for the datatype of the field. The default value changes if and when a user or a programmer updates the field with a different value.
Why choosing the correct field in database is important?
Choosing the correct field in database is very important. It is because the correct field can give you the correct value.
What is the values that the databases uses for the field unless the user enters another value?
The value that a database uses for a field is set to a default value, usually by the database designer. The value can be whatever the company wants it to be, as long as it is valid for the datatype of the field. The default value changes if and when a user or a programmer updates the field with a different value.
What is a key Field?
A field in a part or record that holds the value of a key to that record.
What is key field?
A field in a part or record that holds the value of a key to that record.
What database fields would be the most suitable to use as primary key?
Generally, the most suitable fields to use as a primary key in a database are those that are unique and have a simple and stable value. Common choices include a unique identifier field, such as an auto-incrementing integer or GUID, or a combination of multiple fields that together uniquely identify each record. It is also important to choose a field or combination of fields that do not change frequently to maintain data integrity.
When a user sees a field in a database with a value prior to changing the value the user sees a?
default value
What does the term primary key mean?
The primary key refers to the field in a database that would contain only unique values. For every row in the table, the value in this field would definitely be unique. for example in an employee table, the employee number field would be the primary key. no two employees would have the same employee number.
Why is it necessary to set a unique identifier for student table?
All tables need to have individual identifiers that are unique. That way we can identify each student. All students must have some way of being identified so there is no confusion. If you had two students with the same name, they would have different student numbers that would identify them. In any database it is important to be able to individually identify a record. In a database that is done by having a key field. It cannot be left blank and it cannot have the same value more than once, guaranteeing it is unique.
