"Gale Academic OneFile Database Search" (4:13) by Sandburg Library is licensed under CC-BY
"Using SIRS Researcher" by Missouri State University Libraries (1:52).
Many libraries and database providers have video tutorials that you can find on YouTube. Simply search for the name of the database. Keep in mind, library videos often share how to find a database from their specific library website before sharing how to use the database.
"Introduction to EBSCOhost - Tutorial" (4:17) by EBSCO Tutorials
EBSCOhost provides a number of databases, and most work in the way the video shows. However, there may be different filters to narrow your results between the databases provided by EBSCOhost.
"Getting Started in Nexis Uni" (1:55) by University of Alabama Libraries is licensed under CC-BY