Speaking as a technical development manager, I can say that many people have far less than adequate exposure to SQL, and that training people to use SQL effectively and safely is all too often a common requirement before letting them loose on the database.
There are so many ways people misunderstand and misuse SQL and relational databases, it's honestly staggering.
So, I second the OP. Learn SQL, and you'll stand out.
Yeah, learning real sql is a very useful skill. At one employer, I became the "sql expert" because I knew the difference between inner and outer joins. Which, if you know sql, means you know next to nothing. But knowing next to nothing was better than knowing nothing at all, so...
There are so many ways people misunderstand and misuse SQL and relational databases, it's honestly staggering.
So, I second the OP. Learn SQL, and you'll stand out.