![]() MySQL is one of the most popular SQL databases. A relational database can be considered for any information need in which data points relate to each other and must be managed in a secure, rules-based, consistent way( excerpt from Oracle). There are many scenarios in which keeping track of the relationships could come in very handy.įor example, relational databases could be used to track inventories, process ecommerce transactions, manage huge amounts of mission-critical customer information, and much more. I created a table to help you visualize this concept! All of these tables are related to one another. Only the manager table keeps track of which team member(team member id) is working on which project(project id) and serves as the single source of truth. The project tasks table contains info specific to the tasks(id, project name, project details, and deadlines). ![]() Team members table contains information specific to team members(id,name, and title). In SQL databases, a table is created for each factor(model). The team members report to the manager who keeps track of who is working on what project tasks. A project could have multiple team members. Team members could have have multiple projects. Project management involves three factors: team members, project tasks, and a manager.Īs you can see all of these factors are related to each other. SQL database is a relational database, a type of database that stores and provides access to data points that are related to one another(excerpt from Oracle).įor example, let's say we are managing a database for a project management app for a team. As you can see, the strict rules of SQL database keeps data consistent across applications or database copies you will be working with. In order to store the data, the data must meet all the predefined requirements. Before we can work with data tables, we must define what columns(fields) it has and what type of data(integer, text & etc) this table will hold. SQL database is known for requiring a predefined data schema, which is a collection of database objects such as data tables. I have found them to be helpful!Īs the name suggests, SQL database is written in SQL(Structured Query Language),a programming language used to design relational databases. If you want to delve into the differences between SQL and NoSQL and their use cases, check out these resources. ![]() This tutorial will focus on SQL database. SQL(relational) and NoSQL(non-relational) are the two primary types of databases out there. This is where the database comes in! It is specifically designed to efficiently store and retrieve data. Millions of users will be accessing your app to sell and buy items at the same time.Ĭan you imagine having to read through the entire data file every time someone wants to buy an item? It would take forever and we would end up with lots of frustrated customers! Imagine that you have created the next Amazon e-commerce platform. While this method may have been enough to handle data for simple tutorial apps we have created, it is not an optimal way to manage data for apps in real life. In these examples, we have created(C), read(R), updated(U) or deleted(D) data stored in files in our servers. In my previous blogs, we have learned how to create Ruby on Rails and Node.js/ Express servers from scratch.
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