> Furthermore store the results of calculations in variables if you need them more often.

Is this advice true? If I need the same 'select' ten (or ten thousand) times in a program, 
isn't it just simpler to write that select and let the implementation memoize it?

Its value will not change since the data is the same. Why should I manually
'cache' values if the data model allows to do it consistently and automatically?

David Tolpin

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