PostgreSQL 6.0 was released under the guidance of the new PostgreSQL Global Development Group and amazing work hasn’t stopped since. Postgres95 is released with a very liberal PostgreSQL License, based on POSTGRES source code, but QUEL is replaced with SQL! The monitor terminal application will no longer work, and psql was provided as the new terminal tool for interacting with Postgres95 It maintained the QUEL query language now called POSTQUEL, and so the monitorapplication could continue to be used with POSTGRES POSTGRES (after INGRES) was started and developed. One of the terminal programs that was used to interact with INGRESS was called monitor INGRES, the grandfather of PostgreSQL, developed and used a proprietary query language called QUEL. To understand why PostgreSQL has its own command line utility and why it is so integrated into how developers work with PostgreSQL, we need to take a quick step into the time-travel machine and remind ourselves how PostgreSQL became PostgreSQL. Knowing how to install and use basic psql commands is an essential skill to have for anyone that will connect to PostgreSQL. Many long-term PostgreSQL users, developers, and administrators rely on psql to help them quickly connect to databases, examine the schema, and execute SQL queries. PostgreSQL has a separate command-line tool that’s been available for decades and is included with any installation of PostgreSQL.
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