1st Round (Aptitude mixing of aptitude & SQL & C): This round likely assessed your general problem-solving abilities, along with your foundational knowledge in SQL and C programming.
2nd Round (Technical): This round delved deeper into your technical skills in SQL, PL/SQL (a procedural language extension for SQL), HTML, JavaScript, and CSS. This suggests the role might involve working with databases and web development.
HR Round: This round likely focused on your soft skills, communication abilities, and work ethic. It's also an opportunity for you to learn more about the company culture and see if it's a good fit for you.