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csvkit
A suite of utilities for converting to and working with CSV, the king of tabular file formats.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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trdsql
CLI tool that can execute SQL queries on CSV, LTSV, JSON, YAML and TBLN. Can output to various formats.
Maybe off topic since it’s not SQL, but if you’re working with XML a lot I’d recommend checking out XQuery! There are a few command line implementations like CSVKIT if you google, this one doesn’t seem too awful
I've also had success using this tool to do sql like operations on csv files! https://github.com/BurntSushi/xsv
The trdsql I made is feature-rich and fast (as a similar SQL tool).