Relational model: In the personal model, data are prearranged in tables, which contain of table. A data in a table is called fields. Fields in a db table are also referred as qualities of a db object. A group of related fields are called as a record, which I also called as db object or entity. A group of records are called a table. Keys in a relational db table refer to a key field. To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique. Therefore, key field is used to identify the unique record from a collection of records.
Relational model: In the personal model, data are prearranged in tables, which contain of table. A data in a table is called fields. Fields in a db table are also referred as qualities of a db object. A group of related fields are called as a record, which I also called as db object or entity. A group of records are called a table. Keys in a relational db table refer to a key field. To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique. Therefore, key field is used to identify the unique record from a collection of records.
Chapter1: Overview Of Database Concepts
Section: Chapter Questions
Problem 5HOA: Access path A database table is composed of records and fields hold data. Data is stored in records....
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Relational model:
- In the personal model, data are prearranged in tables, which contain of table.
- A data in a table is called fields.
- Fields in a db table are also referred as qualities of a db object.
- A group of related fields are called as a record, which I also called as db object or entity.
- A group of records are called a table.
- Keys in a relational db table refer to a key field.
- To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique.
- Therefore, key field is used to identify the unique record from a collection of records.
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