It seems as a database engineer, I am going to have to bulk up my skills in non-RDBMS technologies, even if just to be able to say "yes, I am very familiar with

It seems as a database engineer, I am going to have to bulk up my skills in non-RDBMS technologies, even if just to be able to say "yes, I am very familiar with <random non-SQL DBMS> and it's not an appropriate solution to this problem".