Hello,

Normally, to (un)match identifiers/expressions against values, you
have to use regular expressions and the ~= or ~! operators.

However, you can also write:

expression E != NULL;

Whereas the = and != operators are normally meant to (un)match against
other tokens.

Are there other reserved keywords like this one?

-- 
Francis Galiegue, [email protected]
"It seems obvious [...] that at least some 'business intelligence'
tools invest so much intelligence on the business side that they have
nothing left for generating SQL queries" (Stéphane Faroult, in "The
Art of SQL", ISBN 0-596-00894-5)
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