SQL injection has become a predominant type of attacks that target web applications. It allows attackers to obtain unauthorized access to the back-end database by submitting malicious SQL query segments to change the intended application-generated SQL queries. Researchers have proposed various solutions to address SQL injection problems. However, many of them have limitations and often cannot address all kinds of injection problems. Whats more, new types of SQL injection attacks have arisen over the years. To better counter these attacks, identifying and understanding the types of SQL...