BACHELOR OF BUSINESS ADMINISTRATION

Detailed explanation-1: -A primary key is a field or set of fields with values that are unique throughout a table. Values of the key can be used to refer to entire records, because each record has a different value for the key. Each table can only have one primary key.

Detailed explanation-2: -A database table can only have one primary key. It uniquely identifies a record in a relational database table. The value of a primary key can’t be deleted from the tree structure or the parent table. It doesn’t permit null values.

Detailed explanation-3: -The given statement is true. A primary key pinpoints individual entry in the table. It’s a handy key for locating the record in the table in a distinguishing fashion. The value in a primary key is different and cannot match with any other record in the table. The table’s primary key serves as its unique identification.

Detailed explanation-4: -You can only have 1 primary key-the range of keys that could all potentially be the primary key can be referred to as candidate keys. The one you select is the primary key, the other alternative keys can be implemented as unique constraints / indexes.

Detailed explanation-5: -A primary key is a column of table which uniquely identifies each tuple (row) in that table. Primary key enforces integrity constraints to the table. Only one primary key is allowed to use in a table. The primary key does not accept the any duplicate and NULL values.