<BackWhat is the purpose of an ER-diagram in the development process?4/28/2023
In the article on application design, I mentioned ER diagrams. This post will be dedicated to this topic.
Almost any IT solution uses databases. Each record in the database has its own structure.
For ease of understanding of a database, imagine a table in Excel. Let one of the sheets in the table be named "Users". In databases, such sheets are called entities.
For each new user, that is, a new entity, a new row with columns is created on the sheet. Each column stores some user data, such as first name, last name, email, password, registration date. Such a string is called a database record.
Database entities can be interconnected with each other. Imagine that we have two sheets of our Excel spreadsheet - "Users" and "Blog Articles". On the latter there is a column "author", which refers to a row from the table "Users". This is a one-to-one relationship.
It is impossible to keep all these structures and relationships in mind. In addition, you need to follow certain standards in building a database. If they are not followed, then with an increase in the number of records, the performance of the database will decrease. To help in this difficult task comes the DB design tool — ER diagrams.
An ER diagram is a graphical representation of a data structure. It helps to identify the main entities and their attributes that will be used in the system, as well as to determine the relationships between them. This allows you to create a database that will be efficient and easily maintained.
In conclusion, I note that the database is one of the components of an IT solution that affects the user experience. If it is poorly designed, the user will wait longer for a response to his request, which may lead to his departure. Therefore, I recommend not to neglect the database design stage.
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