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unary operator vs function

edited Jan 25, 2012 4:02AM in SQL Language (MOSC) 5 commentsAnswered
Hi,While reading SQL Language  Reference on operators and got a question.
What is the difference between a unary operator and a function? They are very similar in that they both take an argument and returns something.
For example MULTISET looks more like a function than an operator. Did I missed something?
Thanks,
Sha

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