usql - universal command-line interface for SQL databases

usql is a universal command-line interface for PostgreSQL, MySQL, Oracle, SQLite3, Microsoft SQL Server, and other databases.The below is a demonstration using usql with xo's booktest simple test database, showcasing the release version v0.5.0. In the demonstration, usql connects to a PostgreSQL database, executes some queries, with variable interpolation, connects to a SQLite3 database file, and does some more queries, before then connecting to a Microsoft SQL database and ending the session.