What is a candidate key in SQL Server?
Besides, what is candidate key in SQL Server with example?
Candidate Key: The minimal set of attribute which can uniquely identify a tuple is known as candidate key. For Example, STUD_NO in STUDENT relation. The value of Candidate Key is unique and non-null for every tuple. There can be more than one candidate key in a relation.
Similarly, what is difference between primary and candidate key? Difference between Primary Key and Candidate key. Primary Key is a unique and non-null key which identify a record uniquely in table. A table can have only one primary key. Candidate key is also a unique key to identify a record uniquely in a table but a table can have multiple candidate keys.
Also Know, what is the candidate key in database?
A candidate key is a column, or set of columns, in a table that can uniquely identify any database record without referring to any other data. Each table may have one or more candidate keys, but one candidate key is unique, and it is called the primary key.
What is a key in SQL Server?
A key is a single or combination of multiple fields in a table. It is used to fetch or retrieve records/data-rows from data table according to the condition/requirement. Keys are also used to create a relationship among different database tables or views.