Many developers dont realize that by introducing security issues in their code they may be making a hacker rich. There is a bustling market for software flaws such as buffer overflow or SQL injection. The world of hackers is split into three main categories: ethical, white-hat, gray-hat and black-hat. Black-hat hackers are the cybercriminals who use zero-days to break into systems and steal data. SQL injection attacks were responsible for more than half of all data breaches where the attack type had been disclosed.”]
Source: https://securityintelligence.com/inside-the-mind-of-a-hacker-attacking-databases-with-sql-injection/