No, it's not like that at all. RoR is a very specific application, if you can't write a controller then you probably don't know RoR, but it doesn't say you don't know programming in general.
Yes, you can have relational database that doesn't use SQL at all - how many of those are around and popular though? There are some, but not many. What are the chances that you worked with a lot RDBMS, yet never encountered SQL even at the basic level, and it is not immediately evident from your resume, which still says "SQL"? But OK, if that's the situation, you can say "you know, I worked with non-SQL relational databases, and let me tell you about this cool thing I've done that is way better than SQL JOIN can do" - and that might be fine too. Usually though the case is just that people inflate their resumes and think they won't be called out on it. It's very unpleasant because when you interview somebody whose resume looks good, you unconsciously plan that you'd get a great addition to your team - and then you discover he doesn't even know joins... Bummer.
BTW, inner join has nothing to do with MySQL inner nuances - it exists in virtually any SQL implementation out there AFAIK.
Yes, you can have relational database that doesn't use SQL at all - how many of those are around and popular though? There are some, but not many. What are the chances that you worked with a lot RDBMS, yet never encountered SQL even at the basic level, and it is not immediately evident from your resume, which still says "SQL"? But OK, if that's the situation, you can say "you know, I worked with non-SQL relational databases, and let me tell you about this cool thing I've done that is way better than SQL JOIN can do" - and that might be fine too. Usually though the case is just that people inflate their resumes and think they won't be called out on it. It's very unpleasant because when you interview somebody whose resume looks good, you unconsciously plan that you'd get a great addition to your team - and then you discover he doesn't even know joins... Bummer.
BTW, inner join has nothing to do with MySQL inner nuances - it exists in virtually any SQL implementation out there AFAIK.