What is a Candidate Key?

[stuartspindlow]

Hello Friends,

Please tell me What is a candidate key.

[aria34]

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 special, and it is called the primary key. This is usually the best among the candidate keys.

[jackmann17]

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 special, and it is called the primary key. This is usually the best among the candidate keys.

[multisystem]

The candidate keys of a relation tell us all the possible ways we can identify its tuples. As such they are an important concept for the design of database schema.

[johnstark166]

Candidate Key – A Candidate Key can be any column or a combination of columns that can qualify as unique key in database. There can be multiple Candidate Keys in one table. Each Candidate Key can qualify as Primary Key. Primary Key – A Primary Key is a column or a combination of columns that uniquely identify a record

[ankus]

Candidate key is a combination of attributes that can be uniquely used to identify a database record without any extraneous data

[vivaanedwardd]

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 special, and it is called the primary key. This is usually the best among the candidate keys.

When a key is composed of more than one column, it is known as a composite key.

[saiburi]

Thanks friends for sharing about the candidate key.

[amazingds]

In the relational model of databases, a candidate key of a relation is a minimal superkey for that relation; that is, a set of attributes such that:

1. the relation does not have two distinct tuples (i.e. rows or records in common database language) with the same values for these attributes (which means that the set of attributes is a superkey)
2. there is no proper subset of these attributes for which holds (which means that the set is minimal).

[AnnJoseph]

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 special, and it is called the primary key.

[itabhyas]

Candidate keys are those keys which is candidate for primary key of a table. In simple words we can understand that such type of keys which full fill all the requirements of primary key which is not null and have unique records is a candidate for primary key. So thus type of key is known as candidate key. Every table must have at least one candidate key but at the same time can have several.

[Digitalpix]

candidate key is a set of columns, in a table that can uniquely identify any database record without referring to any other data....

[perfecttour]

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 special, and it is called the primary key. This is usually the best among the candidate keys.

[luffy268]

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 special, and it is called the primary key. This is usually the best among the candidate keys.

[pxl]

The candidate key meet all the requirements of the primary key this is potential to the primary key..