On 25 Feb 2014, at 4:31am, Keith Medcalf <kmedc...@dessus.com> wrote:

> does generate a plan with only one execution of each correlated subquery, but 
> does not give me access to the intermediate results

You might experiment with creating a view for the subquery instead of for the 
query as a whole:

CREATE VIEW ratesView AS SELECT RateClass
                                        from TKEmpRateClass
                                       where Year*12+Month-1 <= 
RawYear*12+RawMonth-1
                                    order by Year desc, Month desc limit 1

or even incorporate the coalesce() into it.

Simon.
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