Adriano,

>> 1. param set to value
>> 2. set param to be value

A> Consistent with UPDATE...SET: set param = value

It's not consistent semantically. SET does assignment, whereas what
you are after is binding.

A> But I still prefer :=, as it already have the same functionality in
A> another language, and is a know operator for another purpose in only
A> another one language.

I don't think that borrowing an operator from a different language is
the way to go. Borrowing a similar concept from the same language
is what guarantees consistency.

Ciao
--
Nando Dessena