回复：Re: The != and +/- signs are joined together as an operator

But "!=" is not the same as&nbsp; "<&gt;"

1!=-1,&nbsp; "!=-" as a whole is treated as an operator, not as an operator "!=" -1, but in 1<&gt;-1, it is treated as "<&gt;" -1 instead of "<&gt;-" as a whole&nbsp; is treated as an operator
I think "!=" and "<&gt;" should be treated in the same way

Regards

Tom Lane<tgl(at)sss(dot)pgh(dot)pa(dot)us&gt;&nbsp;在 2025年3月19日 周三 22:34 写道：

"David G. Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com&gt; writes:
&gt; On Tuesday, March 18, 2025, 谭忠涛 <zhongtao(dot)tan(at)seaboxdata(dot)com&gt; wrote:
&gt;&gt; select 1 !=-1;
&gt;&gt; select 1 !=+1;

&gt; Explain why you think it is a bug.&nbsp; From what I see those are potentially
&gt; valid operator names that do not exist so “operator not found” is the
&gt; correct outcome.

Our rules for operator names are here:

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

regards, tom lane