81 lines
4.8 KiB
Markdown
81 lines
4.8 KiB
Markdown
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# Mega Mart Grocery
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## Schema Overview
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The `MEGA_MART_GROCERY` database underpins the core operations of a grocery retail system, managing product categories, customer information, employee details, and sales orders including individual order items.
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## Table Summary
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| Table Name | Primary Responsibility |
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| :--------- | :--------------------- |
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| `Categories` | Organizes products into distinct categories for efficient inventory management and customer Browse. |
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| `Customers` | Stores comprehensive information about all registered customers. |
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| `Employees` | Contains details of all employees involved in the grocery operations. |
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| `OrderDetails` | Links products to specific orders, defining the quantity of each item purchased. |
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| `Orders` | Records each customer order, including who placed it, who processed it, and when. |
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| `Products` | Manages the catalog of all items available for sale within the grocery store. |
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| `Shippers` | Stores information about the companies responsible for delivering orders. |
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| `Suppliers` | Maintains details of all product suppliers. |
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-----
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## `Categories` Table
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This table defines the various categories under which products are grouped. It is essential for organizing the product catalog and enabling filtered searches within the application.
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| Column Name | Data Type | Description |
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| :---------- | :-------- | :---------- |
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| `CategoryID` | INT | Unique identifier for this entity. Used for all lookups and relationships. |
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| `CategoryName` | VARCHAR(25) (Optional) | The name of the product category. |
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| `Description` | VARCHAR(255) (Optional) | A brief explanation of the category. |
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## `Customers` Table
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This table holds the master data for all customers. It is crucial for order processing, customer relationship management, and personalized services.
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| Column Name | Data Type | Description |
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| :---------- | :-------- | :---------- |
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| `CustomerID` | INT | Unique identifier for this entity. Used for all lookups and relationships. |
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| `CustomerName` | VARCHAR(50) (Optional) | The full name of the customer. |
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| `ContactName` | VARCHAR(50) (Optional) | The name of the primary contact person for the customer. |
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| `Address` | VARCHAR(50) (Optional) | The customer's street address. |
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| `City` | VARCHAR(20) (Optional) | The city where the customer resides. |
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| `PostalCode` | VARCHAR(10) (Optional) | The postal code for the customer's address. |
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| `Country` | VARCHAR(15) (Optional) | The country where the customer resides. |
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## `Employees` Table
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This table stores information about the employees of the grocery store. This data is used to track who processed an order and for internal HR functions.
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| Column Name | Data Type | Description |
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| :---------- | :-------- | :---------- |
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| `EmployeeID` | INT | Unique identifier for this entity. Used for all lookups and relationships. |
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| `LastName` | VARCHAR(15) (Optional) | The employee's last name. |
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| `FirstName` | VARCHAR(15) (Optional) | The employee's first name. |
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| `BirthDate` | DATETIME (Optional) | The employee's birth date. Map to `java.time.LocalDateTime` for modern date/time handling. |
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| `Photo` | VARCHAR(25) (Optional) | File path or reference to the employee's photo. |
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| `Notes` | VARCHAR(1024) (Optional) | General notes or additional information about the employee. |
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## `OrderDetails` Table
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This table captures the individual items within each order. It establishes a many-to-many relationship between orders and products, detailing quantities.
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| Column Name | Data Type | Description |
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| :---------- | :-------- | :---------- |
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| `OrderDetailID` | INT | Unique identifier for this entity. Used for all lookups and relationships. |
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| `OrderID` | INT (Optional) | Establishes a relationship with `Orders.OrderID`. Essential for data integrity and joins. |
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| `ProductID` | INT (Optional) | Establishes a relationship with `Products.ProductID`. Essential for data integrity and joins. |
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| `Quantity` | INT (Optional) | The number of units of the product included in this order detail. |
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## `Orders` Table
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This table records each transaction made by customers. It links customers, employees, and shippers to specific orders, providing a complete overview of each sale.
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| Column Name | Data Type | Description |
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| :---------- | :-------- | :---------- |
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| `OrderID` | INT | Unique identifier for this entity. Used for all lookups and relationships. |
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| `CustomerID` | INT (Optional) | Establishes a relationship with `Customers.CustomerID`. Essential for data integrity and joins. |
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| `EmployeeID` | INT (Optional) | Establishes a relationship with `Employees.EmployeeID`. Essential for data integrity and joins. |
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| `OrderDate` | DATETIME (Optional) | The date and time the order was placed. Map to `java.time.LocalDateTime` for modern date/time handling. |
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| `ShipperID` | INT (Optional) | Establishes a relationship with `Shippers.ShipperID`. Essential for data integrity and joins. |
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