Goa Electronics interview questions

what are hooks in react, keys in react, some ways in frontend to avoid multiple api calls, what are some state management libraries in react, how to style react applications, find the max number in an array containing unsorted numbers, What are keys in database mysql, explain primary and secondary key by writing an example, difference between drop, delete and truncate, what are triggers, what are some database functions, what is difference between group by and where clause