Primary key that is used to identify a record uniquely. Primary key is a key that always unique and not null. A system generated primary key is called surrogate key.Primary key is the one which is always unique and not null. Advantage of primary key that it helps in identifying a tuple uniquely.
its a unique key use to identify data in database
That is true :)
The properties of primary key are as follows: 1. It should be unique. 2. It should be not null.
Yes True
A key is a unique part of the record that is used to index.
Unique key
No unique can not be nulll....unique must have any unique value for unique identification.,...
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.
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.
Primary key is a type of unique index with no null constraint on the columns involved. There can only be one Primary key whereas you can create other unique indexes on the table.
Primary key that is used to identify a record uniquely. Primary key is a key that always unique and not null. A system generated primary key is called surrogate key.Primary key is the one which is always unique and not null. Advantage of primary key that it helps in identifying a tuple uniquely.
The Rosetta stone was the key.
The primary key is the designation given to the field or fields that make a record unique in a table. Often times in Access an autonumber field is used as the primary key because Access will always generate a unique number for each record. Having a primary key is not a requirement but it is highly recommended that you have a primary key in each table.
Key is unique for each computer and has to be purchased.
What is meant by a unique selling point and a unique service offer, is to offer your customers something that others do not. This could be something free along with the service or product, or just anything that the consumer cannot get somewhere else.
Primary key