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A Beginner's Guide to RDBMS (Relational Database Management System)
What is a Relational Database Management System (RDBMS)? Learn about RDBMS and the language used to access large datasets – SQL.
RDBMS is an acronym for Relational Database Management System and is a type of database management system that stores data in a structured format using rows and columns, making it easy to locate and access data in relation to another piece of data in the database.
What is a Database?
A database is a set of data stored in a computer. This data is usually structured in a way that makes the data easily accessible.
What is a Relational Database?
A relational database is a type of database. It uses a structure that allows us to identify and access data in relation to another piece of data in the database. Often, data in a relational database is organized into tables.
Tables: Rows and Columns
Tables can have hundreds, thousands, sometimes even millions of rows of data. These rows are often called records.
Tables can also have many columns of data. Columns are labeled with a descriptive name (say, age for example) and have a specific data type.
For example, a column called age may have a type of INTEGER (denoting the type of data it is meant to hold).
In the table above, there are three columns (name, age, and country).
The name and country columns store string data types, whereas age stores integer data types. The set of columns and data types make up the schema of this table.
The table also has four rows, or records, in it (one each for Natalia, Ned, Zenas, and Laura).
What is a Relational Database Management System (RDBMS)?
A relational database management system (RDBMS) is a program that allows you to create, update, and administer a relational database. Most relational database management systems use the SQL language to access the database.
What is SQL?
SQL (Structured Query Language) is a programming language used to communicate with data stored in a relational database management system. SQL syntax is similar to the English language, which makes it relatively easy to write, read, and interpret.
Many RDBMSs use SQL (and variations of SQL) to access the data in tables. For example, SQLite is a relational database management system. SQLite contains a minimal set of SQL commands (which are the same across all RDBMSs). Other RDBMSs may use other variants.
(SQL is often pronounced in one of two ways. You can pronounce it by speaking each letter individually like “S-Q-L”, or pronounce it using the word “sequel”.)
Popular Relational Database Management Systems
SQL syntax may differ slightly depending on which RDBMS you are using. Here is a brief description of popular RDBMSs:
MySQL is the most popular open source SQL database. It is typically used for web application development, and often accessed using PHP.
The main advantages of MySQL are that it is easy to use, inexpensive, reliable (has been around since 1995), and has a large community of developers who can help answer questions.
Some of the disadvantages are that it has been known to suffer from poor performance when scaling, open source development has lagged since Oracle has taken control of MySQL, and it does not include some advanced features that developers may be used to.
PostgreSQL is an open source SQL database that is not controlled by any corporation. It is typically used for web application development.
PostgreSQL shares many of the same advantages of MySQL. It is easy to use, inexpensive, reliable and has a large community of developers. It also provides some additional features such as foreign key support without requiring complex configuration.
The main disadvantage of PostgreSQL is that it can be slower in performance than other databases such as MySQL. It is also slightly less popular than MySQL.
For more information about PostgreSQL including installation instructions, read this article.
Oracle Corporation owns Oracle Database, and the code is not open sourced.
Oracle DB is for large applications, particularly in the banking industry. Most of the world’s top banks run Oracle applications because Oracle offers a powerful combination of technology and comprehensive, pre-integrated business applications, including essential functionality built specifically for banks.
The main disadvantage of using Oracle is that it is not free to use like its open source competitors and can be quite expensive.
Microsoft owns SQL Server. Like Oracle DB, the code is close sourced.
Large enterprise applications mostly use SQL Server.
Microsoft offers a free entry-level version called Express but can become very expensive as you scale your application.
SQLite is a popular open source SQL database. It can store an entire database in a single file. One of the most significant advantages this provides is that all of the data can be stored locally without having to connect your database to a server.
SQLite is a popular choice for databases in cellphones, PDAs, MP3 players, set-top boxes, and other electronic gadgets. The SQL courses on Codecademy use SQLite.
Conclusion
Relational databases store data in tables. Tables can grow large and have a multitude of columns and records. Relational database management systems (RDBMSs) use SQL (and variants of SQL) to manage the data in these large tables. The RDBMS you use is your choice and depends on the complexity of your application.
Original article source at https://www.codecademy.com
#database #sql #sqlite #mysql #postgresql #oracle #sqlserver
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System Databases in SQL Server
Introduction
In SSMS, we many of may noticed System Databases under the Database Folder. But how many of us knows its purpose?. In this article lets discuss about the System Databases in SQL Server.
System Database
Fig. 1 System Databases
There are five system databases, these databases are created while installing SQL Server.
- Master
- Model
- MSDB
- Tempdb
- Resource
Master
- This database contains all the System level Information in SQL Server. The Information in form of Meta data.
- Because of this master database, we are able to access the SQL Server (On premise SQL Server)
Model
- This database is used as a template for new databases.
- Whenever a new database is created, initially a copy of model database is what created as new database.
MSDB
- This database is where a service called SQL Server Agent stores its data.
- SQL server Agent is in charge of automation, which includes entities such as jobs, schedules, and alerts.
TempDB
- The Tempdb is where SQL Server stores temporary data such as work tables, sort space, row versioning information and etc.
- User can create their own version of temporary tables and those are stored in Tempdb.
- But this database is destroyed and recreated every time when we restart the instance of SQL Server.
Resource
- The resource database is a hidden, read only database that holds the definitions of all system objects.
- When we query system object in a database, they appear to reside in the sys schema of the local database, but in actually their definitions reside in the resource db.
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Originscale Order Management System
Originscale order management software helps to manage all your orders across channels in a single place. Originscale collects orders across multiple channels in real-time - online, offline, D2C, B2B, and more. View all your orders in one single window and process them with a simple click.
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How to Efficiently Choose the Right Database for Your Applications
Finding the right database solution for your application is not easy. Learn how to efficiently find a database for your applications.
Finding the right database solution for your application is not easy. At iQIYI, one of the largest online video sites in the world, we’re experienced in database selection across several fields: Online Transactional Processing (OLTP), Online Analytical Processing (OLAP), Hybrid Transaction/Analytical Processing (HTAP), SQL, and NoSQL.
Today, I’ll share with you:
- What criteria to use for selecting a database.
- What databases we use at iQIYI.
- Some decision models to help you efficiently pick a database.
- Tips for choosing your database.
I hope this post can help you easily find the right database for your applications.
#database architecture #database application #database choice #database management system #database management tool
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Digital Assets Management Software Solution | AI-based Assets Management System
A Digital Asset Management System makes it easier to store, manage, and share all of your digital assets on cloud-based storage.
We help you to build Digital Asset Management (DAM) systems with your precise business requirements, whether you want one for maintaining management, production management, brand management systems, or implementing with your sales department with the digital assets it needs.
To learn more about how the Digital Asset Management system will help your business, email us at hello@techavidus.com
#digital assets management #assets management solution #digital asset management system #production management #brand management
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SQL Tutorial - Full Database Course for Beginners. DO NOT MISS!!!
In this course, we’ll be looking at database management basics and SQL using the MySQL RDBMS.
⭐️ Contents ⭐
⌨️ (0:00) Introduction
⌨️ (2:36) What is a Database?
⌨️ (23:10) Tables & Keys
⌨️ (43:31) SQL Basics
⌨️ (52:26) MySQL Windows Installation
⌨️ (1:01:59) MySQL Mac Installation
⌨️ (1:15:49) Creating Tables
⌨️ (1:31:05) Inserting Data
⌨️ (1:38:17) Constraints
⌨️ (1:48:11) Update & Delete
⌨️ (1:56:11) Basic Queries
⌨️ (2:08:37) Company Database Intro
⌨️ (2:14:05) Creating Company Database
⌨️ (2:30:27 ) More Basic Queries
⌨️ (2:26:24) Functions
⌨️ (2:45:13) Wildcards
⌨️ (2:53:53) Union
⌨️ (3:01:36) Joins
⌨️ (3:11:49) Nested Queries
⌨️ (3:21:52) On Delete
⌨️ (3:30:05) Triggers
⌨️ (3:42:12) ER Diagrams Intro
⌨️ (3:55:53) Designing an ER Diagram
⌨️ (4:08:34) Converting ER Diagrams to Schemas
📺 The video in this post was made by freeCodeCamp.org
The origin of the article: https://www.youtube.com/watch?v=HXV3zeQKqGY&list=PLWKjhJtqVAblfum5WiQblKPwIbqYXkDoC&index=8
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