Exploiting SQL injection with no space

With Exploitation scenario:

SQL Injection: A SQLI attack consists of an injection in SQL query via user supplied input to the application. A successful SQL injection exploit can read sensitive data from the database, modify database data (Insert/Update/Delete), execute operations on the database.

SQLi occurs when an application uses invalidated user input to dynamically construct SQL query.

Example: We want to retrieving data from a library application that publishes articles.