COMPUTER SCIENCE AND ENGINEERING
DATABASE MANAGEMENT SYSTEM
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Query
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Primary Key
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Record
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Secondary Field
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Detailed explanation-1: -Primary Key-a field containing a value that uniquely identifies each record in a table. Primary Key-a field containing a value that uniquely identifies each record in a table. The primary key is unique and prevents entering duplicate records or a null value in that field.
Detailed explanation-2: -Primary key A table can have only one primary key. A primary key consists of one or more fields that uniquely identify each record that you store in the table.
Detailed explanation-3: -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.
Detailed explanation-4: -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.