0
With reference to Databases, what are Primary keys?
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
What is the primary key field of a database?
its a unique key use to identify data in database
What can happen if a database has no primary key?
mem will lost
What is the primary key field in a database?
what is a Absolute reference
How primary keys in database are denoted?
In the actual SQL, by means of the primary key constraint.
Why do you need the primary key in the database?
without you will not be able to create a relationship
What is the primary key field of a database?
its a unique key use to identify data in database
What is the meaning of key in database?
A key is one or more fields in a database table which can be used to help identify a particular row of the table. A primary key is one such that uniquely defines a single given row. A foreign key is a set of one or more fields in one table which is the primary key to a row of another table.
What is the difference between primary key and secondary key in database?
A primary key is a unique identifier for each record in a database table and is used to ensure data integrity and enforce entity integrity. A secondary key, also known as a candidate key, is an alternate unique key that can be used to identify records, but is not designated as the primary key.
Can you insert primary key only to one field in the database?
Yes. Primary key can be inserted to one field in the database. The field should be unique and not null.
Does a primary key have to be an integer in an Access database?
No, it does not. A primary key can be different types of data, not just an integer.
How do you change the primary key?
What type of database are you using
What can happen if a database has no primary key?
mem will lost
What is the primary key field in a database?
what is a Absolute reference
When a primary key is begging assigned by the database automatically it is called?
autonumber key
How primary keys in database are denoted?
In the actual SQL, by means of the primary key constraint.
What is difference between primary key and foreign key?
A primary key is an attribute (or combination of attributes) that uniquely identifies each row in a relation. A primary key is designated by underlining the attribute name. The primary key of an entity set allows us to distinguish among the various entities of the set. A foreign key is an attribute in a relation of database that serves as the primary key of another relation in the same database.
What is primary key constraint?
Primary Key is a Constraint Used to avoid Duplicate entries in database table and you define primary key the column doesn't allow NULL values.
