All DBAs will need to be proficient in SQL, including DML and DDL statements, as well as relevant platform specific configuration commands. For a junior DBA it is unlikely they will need to be able to write complex analytical queries, so it is more important that you have a broad knowledge of how to get a range of things done using simpler queries.
Tony has 20 years experience building software and services business using advanced analytics, collaboratively using computers to do what they do best and empowering people to do what they do best.
He is the co-founder of RockSolid SQL (now part of DXC Technology) and has grown the business to over 130 customers globally, and is also an adviser for LiquidityCube, one of the most exciting emerging fintech startups right now. Tony has written numerous books, articles and posts on data driven business and regularly presents at data focused conferences.