Do they not know or are they bad at interviewing? Twenty years out of college and I still remember my first interview (it was that bad). Where I went to colle

Do they not know or are they bad at interviewing? Twenty years out of college and I still remember my first interview (it was that bad). Where I went to college Databases was an elective, but I did take it. Interviewer asked a real softball "What is a Join?", I froze and couldn't answer it. Needless to say I didn't get that job. I still do poorly at interviews, but I have gotten a little better.