Every single employee--no matter what field you are in--should know how to pull subsets of data from a database. If you can't do this, you will be at a disadvantage because you will always have to wait for someone from IT to do it for you which adds greater cost to the company.
Most databases you will have access to are based on a language called Structured Query Language (SQL) . SQL is a language for creating, modifying, selecting, and deleting the tables, rows, fields, and data stored within a DBMS. Unless you are the database administrator, the primary use you will have for SQL is in "selecting" (i.e. querying) the data. Fortunately, SQL is fairly consistent across all DBMSs. These videos cover how to perform various skills in SQL.
To follow along with the videos below, begin by downloading the data found here: Gold Star HT database