56 lines
No EOL
3.7 KiB
Markdown
56 lines
No EOL
3.7 KiB
Markdown
---
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tags:
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- Programming_Languages
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- Databases
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- sql
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---
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# SQL: Demonstration database
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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.
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This database stores information about computers, their manufacturers, properties and sale data:
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* The overall database is `computer_sales`
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* It contains the following [tables](/Databases/Relational_database_architecture.md#table): `manufacturer`, `model`, `sales`
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* 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.
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The model table:
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````
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model_id manufacturer_id name cpu_speed ram cores wifi release_date
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---------- --------------- ---------------------- ---------- ---------- ---------- ---------- ------------
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1 1 Raspberry Pi 1 Model A 0.7 256.0 1 0 2013-02-01
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2 1 Raspberry Pi 1 Model B 0.7 256.0 1 0 2012-04-01
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3 1 Raspberry Pi 1 Model B 0.7 512.0 1 0 2012-10-01
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4 1 Raspberry Pi 1 Model A 0.7 512.0 1 0 2014-11-01
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5 1 Raspberry Pi 1 Model B 0.7 512.0 1 0 2014-07-01
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6 1 Raspberry Pi 2 Model B 0.9 1024.0 4 0 2015-02-01
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7 1 Raspberry Pi 3 Model B 1.2 1024.0 4 1 2016-02-01
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8 1 Raspberry Pi 3 Model B 1.4 1024.0 4 1 2018-03-14
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9 1 Raspberry Pi 3 Model A 1.4 1024.0 4 1 2018-11-01
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10 1 Raspberry Pi 4 Model B 1.5 1024.0 4 1 2019-06-24
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11 1 Raspberry Pi 4 Model B 1.5 2048.0 4 1 2019-06-24
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12 1 Raspberry Pi 4 Model B 1.5 4096.0 4 1 2019-06-24
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13 1 Raspberry Pi Zero 1.0 512.0 1 0 2015-11-01
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14 1 Raspberry Pi Zero W 1.0 512.0 1 1 2017-02-28
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15 2 Apple Lisa 0.008 1.0 1 0 1983-01-19
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16 2 Apple iMac 3.7 8192.0 4 1 2019-03-19
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17 2 Apple MacBook Pro 2.6 16384.0 6 1 2019-05-21
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18 2 Apple MacBook Air 2.6 8192.0 2 1 2019-07-09
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19 3 Commodore VIC-20 0.00102 0.005 1 0 1980-01-01
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20 3 Commodore 64 0.001023 0.064 1 0 1982-08-01
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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
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--------------- ------------ ----------------------- ------------ ----------
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1 Raspberry Pi <https://raspberrypi.org> 2008 1
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2 Apple <https://apple.com> 1976 1
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3 Commodore <https://www.commodore.c> 1954 0
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```` |