DATABASE SCHEMAS
WHAT IS A DATABASE SCHEMA?
The database
schema is the formal language-supported structure of a database that is
supported by the database management system (DBMS).
It refers to a structure that represents relationships among
data and defines how information is stored in a database.
This includes logical limitations such as table names,
fields, data types, and the connections between these entities.
- It can help database administrators to manage the normalization process to avoid data duplication
TYPES OF
DATABASE SCHEMAS:
There are five
types of Databases Schema:
- Conceptual Schema
- Physical Database Schema
- Logical Database Schema
- Star schema
- Snowflake schema
Mainly three
types of database schemas.
Conceptual
Schema:
- It is also called the High-level data model and conceptual data model.
- It is a summary of the informational requirements that guide database architecture. Usually, it merely covers the key ideas and their primary connections.
- It typically includes only the main concepts and the main relationships among them.
Physical
Database Schema:
- The physical database schema describes how data is saved on disc storage or a data destination. In terms of schema, the physical schema is the lowest level of abstraction.
- It is the primary database schema type for other types of schemas.
- It defines how the data is stored in secondary storage.
Logical
Database Schema:
- Compared to other types of database schemas, logical database schemas are less abstract.
- Table names, field names, entity relationships, and integrity constraints—i.e., any regulations governing the database—are all well-defined schema objects with information
- In the logical database, the data stored physically is illustrated as attributes.
BEST
DATABASE SCHEMA DESIGN TOOLS:
- Visual Paradigm ERD Tools
- Vertabelo
- Lucidchart
- SQLql Server Database Modeler
- Dezign For Databases
- Erwin Data Modeler
- Dbdesigner.Net
- Dbwrench
- dModelAid
- IBM Infosphere Data Architect
I am using DbDesigner.net
for creating Database Schema:
- It is easy to understand, and the Application interface is also simple.
- Best database schema designer for fresher.
Application/
website Link : https://www.dbdesigner.net/
- Click on start designing for free.
- Enter your name, email, password, and company name after entering all the required data click on create account or simply click on signup with google.
- This is an application interface, it contains mainly two sections:
1. Navigation menu
2. Project List
- I have already created four schema designs. Click on Create NEW PROJECT for creating a new schema design.
- This is our plot area or schema designing area
- First, we need to create a project file: click on schema<<<< select new and enter project name<<<< select data type.
HOW TO
CREATE DATABLE:
- Click on insert select table.
- Enter table name <<< Table content <<<click on save button.
- Enter column name, size type, primary, and foreign keys and click on the save button.
- There are three types of importing options:
1. SQL
2. Pdf
3. Image format
- There are two types of sharing options:
1. You can share by sending an invitation
email and sharing your project URL.
CONCLUSION:
Database schemas
are the blueprint for the project. By using schema design we can easily understand
database details.
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