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---
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categories:
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- Databases
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- Programming_Languages
tags: [SQL]
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---
# SQL: Demonstration database
For the purposes of demonstration we will work from a made-up database. The examples are created using SQLite but they are transferable to any SQL database.
This database stores information about computers, their manufacturers, properties and sale data:
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- The overall database is `computer_sales`
- It contains the following [tables ](/Databases/Relational_database_architecture.md#table ): `manufacturer` , `model` , `sales`
- Example [fields ](/Databases/Relational_database_architecture.md#field ) that belong to these tables: `manufacturer_id` , `model_id` , `name` , `year_founded` , `ram` , `sale_date`
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Below are the `model` and `manufacturer` tables output from the SQLite terminal client.
The model table:
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```
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model_id manufacturer_id name cpu_speed ram cores wifi release_date
---------- --------------- ---------------------- ---------- ---------- ---------- ---------- ------------
1 1 Raspberry Pi 1 Model A 0.7 256.0 1 0 2013-02-01
2 1 Raspberry Pi 1 Model B 0.7 256.0 1 0 2012-04-01
3 1 Raspberry Pi 1 Model B 0.7 512.0 1 0 2012-10-01
4 1 Raspberry Pi 1 Model A 0.7 512.0 1 0 2014-11-01
5 1 Raspberry Pi 1 Model B 0.7 512.0 1 0 2014-07-01
6 1 Raspberry Pi 2 Model B 0.9 1024.0 4 0 2015-02-01
7 1 Raspberry Pi 3 Model B 1.2 1024.0 4 1 2016-02-01
8 1 Raspberry Pi 3 Model B 1.4 1024.0 4 1 2018-03-14
9 1 Raspberry Pi 3 Model A 1.4 1024.0 4 1 2018-11-01
10 1 Raspberry Pi 4 Model B 1.5 1024.0 4 1 2019-06-24
11 1 Raspberry Pi 4 Model B 1.5 2048.0 4 1 2019-06-24
12 1 Raspberry Pi 4 Model B 1.5 4096.0 4 1 2019-06-24
13 1 Raspberry Pi Zero 1.0 512.0 1 0 2015-11-01
14 1 Raspberry Pi Zero W 1.0 512.0 1 1 2017-02-28
15 2 Apple Lisa 0.008 1.0 1 0 1983-01-19
16 2 Apple iMac 3.7 8192.0 4 1 2019-03-19
17 2 Apple MacBook Pro 2.6 16384.0 6 1 2019-05-21
18 2 Apple MacBook Air 2.6 8192.0 2 1 2019-07-09
19 3 Commodore VIC-20 0.00102 0.005 1 0 1980-01-01
20 3 Commodore 64 0.001023 0.064 1 0 1982-08-01
21 3 Amiga 500 0.00716 0.5 1 0 1987-04-01
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```
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The manufacturer table:
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```
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manufacturer_id name url year_founded trading
--------------- ------------ ----------------------- ------------ ----------
1 Raspberry Pi < https: / / raspberrypi . org > 2008 1
2 Apple < https: / / apple . com > 1976 1
3 Commodore < https: / / www . commodore . c > 1954 0
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```
