Updated May 9, 2023
Introduction to MySQL Relational Database
MySQL Relational Database is an assemblage of relational data structured or organized in tables, columns, and rows, where tables represent the objects, columns represent the fields,, and rows represent the records. It is the broadly used relational database management system, as it is available for free of cost and available as an open-source for anyone to use. In this application, SQL (Structured Query Language) programming language is used to create, update, delete & manage the tables and their contents, as MySQL is supported with the basic SQL queries.
Relation Control System of MySQL relational database
- From the specific definition of the relational database, people think it’s too critical for maintaining and will create confusion. But that is not a true statement; a relational database’s main agenda is to avoid any kind of confusion or complication between multiple tables involved with that specific database, where it helps a developer to maintain and verify easily without any struggle.
- ISupposewe consider any relational design, that is very common, maintains a strict relationship between all the related tables defined in the database. Suppose we have an Inventory Controlling System. In that case, we must maintain strict relationships between all tables involved, providing detailed descriptions related to the inventory.
- Also, it needs to maintain a more strict relationship with those child tables, which additionally impacts any kind of data manipulation activity like inserting or deleting from that specific inventory. As examples, we will consider three tables involved in the inventory controlling system, assuming three are interrelated.
Table Name: Inventory
| ID (Primary Key) | Description | Price | Stock |
Table Name: Sales_Staff
| ID (Primary Key) | Name | contact |
Table Name: Invoice
| ID (Primary Key) | SalesStaff_ID( Foreign Key of Sales_Staff Primary Key) | Inventory_ID (Foreign Key of Inventory Primary Key) | Quantity | Price | comment |
- Now considering the above three tables, we can plan the relationship between multiple tables using primary key and foreign key constraints. In the above example, invoice is the main transactional table, where all the transactional data has been stored successfully for every invoice generation on individual customers or end-user. It stores all the invoice data successfully for any kind of reference.
- Now invoice should generate from some inventory details where a quantity of the entire inquiry has been stored for one entire shop or organization. Now considering two key master tables Inve,ntory and Sales_Staff, both the tables maintain the main store details of any specific item in that shop or organization, whereas Sales_Staff maintains all the staff details which are working in that shop or organization. Rather than mkeepingthe same staff or specific item every time in inventory transactional details, it holds oa particularreference of those master tables, which some administrator of the shop or organization maintains.
- So by this specific approach, we can easily avoid data redundancy or repetition, which always helps fetch data based on a maintained relationship between multiple tables. This example gives one key characteristic of any relational database like MySQL relational database that is assuming one invoice data always holds the reference of specific inventory and sales staff, but inventory or sales staff is never able to change or update anything in the created invoice.
- So here, it maintained one too many relationships where one inventory data can exist in invoice multiple times, and the same sales staff data can exist in invoice numerous times. This relationship helps the developer for fetching data smoothly with specific joining conditions and also understanding or designing any ER diagram will be very easy for them. Here is a key point to mention: when a salesperson tries to sell something from the stock, they must maintain this kind of relationship to ensure a successful sale.
- Whenever any inventory is added to the invoice,, it automatically subtracts stock from the original inventory, so it will always provide a proper validation message whenever a a salesperson tries to create any kind of invoice for a a specific inventory. If we look closely on those table relationship, then inventory have one primary key name Id, and Sales_Staff have one primary key name ,ID, but invoice has two foreign key, which is maintained the relationship with Inventory and Sales_Staff tables.
- It also ensures that anything that exists in the Inventory or Sales_Staff table can be inserted into the Invoice table, without the existence of any specific data, it cannot be possible to make one entry in the Invoice table. As the Invoice table has one specific foreign key relationship with both of these tables, so anything existing on those tables only can able to make an entry in the Invoice table. So it always helps a developer in case of making some wrong insert without maintaining those data on child tables.
Guidance of installing My SQL Relational Database
There have many kinds of the version available on the internet for installing MySQL on your local PC. Still, MySQL Organization comes with one exciting feature with a free sample of a relational database, can varieties methods that are more advanced than other free samples of a relational database. It can allow storing movie data, one of the key points is harmless user experience, means suppose one user somehow make some mistake that’s why database entirely not working. In that case, it is very easy or can say the 2-minute task to restore that database from the source.
1. Download the MySQL relational database from bthe elow link:
- http://downloads.mysql.com/docs/sakila-db.tar.gz
2. Executing bthe elow script for unpacking the archival package:
- tar –xzf xxxx-db.tar.gz
3. After unpacking the same, it will create 3threedirectories like the below:
- Xxxx/sakila-db.sql
- Sakila-schema.sql
- Sakila.mwb
4. Now run MySQL basic command:
- Mysql –p (password)
5. Now, just follow the instructions mention in sakila-db.sql and sakila-schema.sql.
6. If you follow all instructions correctly, you will create a new database named ‘sakila’ and it will automatically display in the list of MySQL relational databases.
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