fdw m4

store the data into a collection of tables, which might be related by common fields.

• Specifying Queries as Relational Expressions

• Relational Database Management System

• Relational Model

• Structured Query Language

A collection of relations required to build a database.

• Relational Model

• Relational Database Management System

• Structured Query Language

• Data Definition Language

a row of records in the given table.

• Tuple

• Attributes

• Relation

• Domain

- the table itself.

• Attributes

• Tuple

• Relation

• Domain

the data type describing the types of values that can appear in each column.

• Attributes

• Tuple

• Relation

• Domain

the individual columns in the table

• Attributes

• Tuple

• Relation

• Domain

a particular column or set of columns whose value uniquely identifies each row in the table.

• Primary Key

• Tuple

• Attribute

• Foreign Key

a column in one table whose value matches with the primary key of another table.

• Foreign Key

• Primary Key

• Tuple

• Domain

it uses a few lines to express complex queries that would take pages in a hierarchical database.

• Structured Query Language

• Relational Database Management System

• Structured English Query Language

• Specifying Queries as Relational Expressions

It adapts the SQUARE ideas to a more English keyword approach.

• Structured Query Language

• Relational Database Management System

• Structured English Query Language

• Specifying Queries as Relational Expressions