The string form of this Select.

The Select format is:

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<i>expression</i> AS <i>derived-prop-name</i>

where expression is the string form of an IExpr expression and derived-prop-name is the name of the derived property that will be produced.

This string:

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AVG(Amount) / MAX(Amount) AS AvgOverMax

is returned if the derived property name is AvgOverMax and the expression assigns the ratio of the average Amount value to the maximum "Amount" value.