Apple Data Engineer interview questions

There were two phone interview and an onsite interview with 5 interviews. Mostly SQL. The focus is on aggregate functions, window functions etc. There were database design questions also. There programming and data mining questions also. Overall it was a good experience. All the interviewers were nice. But at the end, the recruiter never told me the results of the interview. Even after mailing her multiple times. Did not expect this unprofessional approach from Apple.