I feel like SQL is a bit of a categorically different thing to the others on this list. It's best to have python (or another language) and SQL, if you're going to be in a 'coder' role.
If you're in an analyst type role, with SQL as your primary language, then SQL and Py/R is also a good thing.
If you're in an analyst type role, with SQL as your primary language, then SQL and Py/R is also a good thing.