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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Rafia Sabih <rafia.pghackers@gmail.com>
cc: jhecht@cirilgroup.com, pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #18689: psql : operator "!=" do not behave like "<>"
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Rafia Sabih <rafia.pghackers@gmail.com> writes:
> Thank you for reporting this. However I found that the lack of space in =
the
> statement is causing this.
> On trying it like select -1 !=3D -1; it works fine.

Right, see

https://www.postgresql.org/docs/current/sql-syntax-lexical.html#SQL-SYNTAX=
-OPERATORS

particularly the bit about "A multiple-character operator name cannot
end in + or -, unless ...".  "!=3D-" will be treated as one operator,
but "<>-" will not.

			regards, tom lane