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What are some examples of a primary key?
In a database a primary key is a unique value, meaning that it cannot be repeated. It is also mandatory, so it cannot be left blank. Something like a product code, an ISBN number, a student number, an employee number etc. would be primary keys.
What database fields would be the most suitable to use as a primary key Student Name?
It is recommended to use a unique identifier such as a student ID number as a primary key instead of the student name. This is because names are not always unique and can change, while an ID is a reliable and stable way to uniquely identify each student's record in the database.
Is a student form suitable for a database field to use as a primary key?
no
Give some example for primary key unique key and candidate key?
Primary key:------------Definition: The primary key of a relational table uniquely identifies each record in the table. It can either be a normal attribute that is guaranteed to be unique (such as Social Security Number in a table with no more than one record per person) or it can be generated by the DBMS (such as a globally unique identifier, or GUID, in Microsoft SQL Server). Primary keys may consist of a single attribute or multiple attributes in combination. Examples:Imagine we have a STUDENTS table that contains a record for each student at a university. The student's unique student ID number would be a good choice for a primary key in the STUDENTS table. The student's first and last name would not be a good choice, as there is always the chance that more than one student might have the same name.Candidate key:-----Definition: A candidate key is a combination of attributes that can be uniquely used to identify a database record without any extraneous data. Each table may have one or more candidate keys. One of these candidate keys is selected as the table primary key.
What not a likely primary key?
A field that is not unique and null can not be used as a primary key. Praimary key must satisfy the conditions of not null and unique.
Is an id number considered a primary key?
A ID number can indeed be used as a primary key because it will be a unique value for every record in the table.
Is the last name a primary key?
A primary key is always unique and not null. It is prefer to choose a field that is unique like roll number . But to choose Last name as a primary key is not a good option as two people can have same last name.A Last name field is not a good one for a primary key. A primary key cannot have duplicate values. A last name field is highly likely to have duplicate values, so it should not be used as a primary key.
Which field MS Access will not allow you to delete?
A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.
What is a simple key in database?
A simple key consists of a single attribute to uniquely identify an entity occurrence, for example, a student number, which uniquely identifies a particular student. No two students would have the same student number.
Candidate key and primary key differnece?
All Primary keys are definitely Candidate Keys. A Candidate key is one which can be used as a Primary key that is not null and unique. That is one of the candidate keys can be chosen as a primary key.A Candidate key is a Unique Key and it can be used to find out any particular Tuple (row) in a table. The following are the differences between A Candidate key and a Primary Key: 1) A Unique key can be null but not a Primary key 2) On a table we can have only 1 primary key but 'N' number of unique keys.
What is the table's primary key?
Primary key is the unique attribute among all attributes of an object, which alone is sufficient to represent a sigle entity. for example a table has columns student id, stdent name, father name, class, department etc. so here "student id" is primary key bcoz it cann't be same for two students, where other attributes like name and class can be same for more than one student. hence primary key is the attribute which represent a unique entity and is sufficient to search the tuple (row) of table having that primary key value. Firdous Anjum The Great :) COMSATS Institute of Information Technology, Lahore.
Can the FirstName column be a primary key?
A First name field is not a good one for a primary key. A primary key cannot have duplicate values. A first name field is highly likely to have duplicate values, so it should not be used as a primary key.
