Geoff Winkless <pgsqladmin@xxxxxxxx> writes: > I was surprised to find that whitespace is required between the != > operator and a negative sign, otherwise postgres believes that I'm > intending !=- as an operator (I get "operator does not exist: integer > !=- integer"). > This isn't the case with <>-x. > Is this intentional? I couldn't find reference to it in the > documentation (certainly not in > http://www.postgresql.org/docs/9.5/static/functions-comparison.html). That's a syntax issue, so the place to look is http://www.postgresql.org/docs/9.5/static/sql-syntax-lexical.html#SQL-SYNTAX-OPERATORS In general you need whitespace between adjacent operator names, but we hacked the lexer enough so that you can get away without it in the single case of a prefix "+" or "-", so long as the previous operator name contains only characters used in SQL operator names. It would likely have been cleaner to just disallow operator names ending in "+" or "-", but we had several long-established names that failed to conform to that, so this was the best compromise we could come up with between flexibility and SQL standard compliance. regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
