September 2017
Beginner to intermediate
412 pages
8h 55m
English
Content preview from Java Data Analysis
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Relational databases
A relational database maintains a collection of database objects, including relations (tables) and the specified constraints upon them. The relation in the following table could be combined with the one in Table 5-1 to form a relational database:
|
Dept ID |
Name |
Director |
|---|---|---|
|
HR |
Human Resources |
34953 |
|
IT |
Information Technology |
23098 |
|
DA |
Data Analysis |
15584 |
Table 5-2. A database table of departments
This would also include the designated primary keys ID for the Employees table and Dept ID for the Departments table.
The schema for the relational database itself is the collection of table headings, their corresponding datatypes, and their key designations. We could specify the schema for this two-table database as:
Employees(ID, ...
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