Oracle Expressions

Hi, i am having a doubt considering what is a proper oracle expression.

http://www.acs.ilstu.edu/docs/Oracle/server.101/b10759/statements_10002.htm

In the select referene, there is a number of times where the expr statemnt appears.

I am trying to figure out what an expr is: is it simply a sequence of Varibles, Constants, function and Operators that are evaluated to a result.

Or can you include more sophisticated things like If statemnets?

For Example in the "Description of the illustration model_rules_clause.gif"
you have got a vector index being assigned an Expression. Could this expression include if statements?

If so... i don't seem to be able to execute it with them.

Thanks in advance. Received on Wed Oct 22 2008 - 09:31:05 CDT