All rows in a database need to have a unique identifier. But what if you need to have unique identifiers for all of the rows in all of your tables? We know GUIDs are problematic when indexing, so what other options are there? A database sequence might be a great option. What Is a Database Sequence? A database sequence is a type of object created in a database that allows developers to generate unique values.
Database constraints allow you to give a certain shape to your data, tables, and columns. Are you planning to use PostgreSQL as your database? Check out what PostgreSQL constraints can do! In this article, we will go over PostgreSQL’s database constraints and see how to model them in Vertabelo. For each of the constraints, I’ll provide: A definition of the constraint. A usage example. Instructions on how to model the constraint in Vertabelo.
A data model is more than just a pretty drawing that impresses users and stakeholders. When you add model validation to the design process, your data model can save you many hours of database-related work. When you design a data model, your ultimate goal is for the model to become a functional database. However, your model is basically a drawing, while the database is a not-so-flexible structure that holds information.
Find out how to easily import an existing database into the Vertabelo data modeler. If you're reading this article, you probably know you need to import your database into Vertabelo. Or maybe you’re wondering if you should do it. Here are some reasons that can convince you if you’re hesitating. And we’ll also explain how to import a database into Vertabelo. Why Import an Existing Database into Vertabelo? 1. You'd like to analyze the database structure.
Complex database models are challenging to read and manage. In Vertabelo, you can use many different techniques, including color-coding tables and encapsulating groups of tables in subject areas. Doing this will increase the model’s readability, making it easier to navigate and search within it. A complex data model can be organized using subject areas. Subject areas in Vertabelo are named rectangles that group tables based on a functional or business context.
Better model organization will help you get work done faster. It will become easier to find objects in the model and to onboard new people to the team. In this article, we will give you tips and show you Vertabelo features that will help you effectively organize a large ERD. Sample ERD To discuss entity relationship diagram (ERD) organization, we will be using a recruitment system database model. By the end of this article, you will be able to make this model much better organized and more readable.