If you want to run joins on text tables, the coreutils have a "join" tool. You already have it installed:
https://www.gnu.org/software/coreutils/manual/html_node/join...
And to improve the ergonomics, the vnlog wrappers are available to operate on field names, while retaining the internals of the core tools:
While mentioning alternatives, xsv[1] can do joins on csv files instead of doing naive comma splitting. Also unlike gnu join, xsv does not require input to be sorted (afaik)