Before you do anything, you start with designing the database. It includes columns, tables, and relationships among them, as well as constraints. Database constraints play a crucial role in that they let you prevent any undesired data from being stored in a column or table. Let’s see how to make use of database constraints in MySQL. In this article, we’ll go through all database constraints available in a MySQL database:
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.
Database constraints help us keep our data clean and orderly. Let’s look at the most common database constraints and how to conveniently define them in Vertabelo. It’s a common practice to set rules for the data in a database. Thanks to these rules, you can avoid incorrect data in a column, e.g. a text string in an Age column or a NULL in a Name column. In this article, we’ll dive into SQL’s database constraints: PRIMARY KEY, FOREIGN KEY, NOT NULL, UNIQUE, DEFAULT, and CHECK.