Infosys interview questions

It took long duration for the whole interview process to get complete and release offer letter from infosys and sometimes the technical interviewer will not join and they will not respond about rescheduling the interview

They asked me the following questions: Questions related to different Git commands, including how to push to and pull from a GitHub repository. Write code to count the total number of unique alphabets in an array. Optimize the above solution and discuss its time and space complexity. Write an SQL query to find the second highest salary of an employee. Questions on normalization and ACID properties.