https://github.com/eftec/example-relationaldatabase

It is a library
https://github.com/eftec/example-relationaldatabase

Last synced: 3 months ago
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It is a library

• Host: GitHub
• URL: https://github.com/eftec/example-relationaldatabase
• Owner: EFTEC
• License: mit
• Created: 2020-07-04T17:52:30.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2020-07-05T00:01:51.000Z (almost 5 years ago)
• Last Synced: 2024-12-29T08:13:44.022Z (4 months ago)
• Language: TSQL
• Homepage: https://www.eftec.cl
• Size: 575 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Example of a minimal relational database

It is a minimal relational database for MySQL and Sql Server

## Objectives of the database

* To have a database with different kind of relations of tables.

  * MANY TO ONE

  * ONE TO MANY

  * MANY TO MANY

  * ONE TO ONE

  * MANY TO MANY

  * (optional) MANY TO ONE & MANY TO ONE & ONE TO MANY

* Minimal information. This database has at most 5 rows of data.

* It has a few nulls

* All tables have the prefix "**Table**". 

* All Primary Keys (PKs) are of the type **int** and they have a postfix "**PK**"

  * Some of them are identity.

* All Foreign Keys (FKs) are of the type **int** and they have a postfix "**FK**"

* The table **TableParent** showcase the next types

  * int

  * varchar

  * decimal

  * datetime

* The table **TableParent** has the next keys

  * Primary Key

  * Foreign Keys

  * Unique Key

  * Regular Key

## Description

The main table is the table **TableParent**. It could be used as the initial table.

## Tables

| Table                | Relation with Parent                    | Example                                                      |

| -------------------- | --------------------------------------- | ------------------------------------------------------------ |

| TableParent          | -                                       | -                                                            |

| TableChild           | Many To One                             | TableParent - TableChild                                     |

| TableGrandChild      | Many to One - Many to One               | TableParent - TableChild - TableGrandChild                   |

| TableGrandChildTag   | Many to One - Many to One - One to Many | TableParent - TableChild - TableGrandChild - TableGrandChildTag |

| TableParentxCategory | Many to Many                            | TableParent - TableParentxCategory - TableCategory           |

| TableCategory        | Many to Many                            | TableParent - TableParentxCategory - TableCategory           |

| TableParentExt       | One to One                              | TableParent - TableParentExt                                 |

> Note: **TableParent** doesn't have a One To Many relation but **TableChild** has it.

>

> Note: **TableParent** is related two times with the **TableChild**

## Diagram

![img/diagram.png](img/diagram.png)

## Mysql Install

[mysql/mysql.sql](mysql/mysql.sql)

Run the next script. It will create the database called **testdb**

> This database is compatible with MySQL 8.0 and higher. It could run with MySQL 5.x but it could require to change the encoding.

## Sql Server Install

Recover the next backups.

For Sql Server 2012 and higher

[sqlserver/testdb2012.bak](sqlserver/testdb2012.bak)

For Sql Server 2019 and higher

[sqlserver/testdb2019.bak](sqlserver/testdb2019.bak)

## Copyright

MIT License

Copyright (c) 2020 Escuela de Formación Técnica Chile SPA

## Changelog

* 1.0 2020-07-04 First version