NVL replaces NULL by specified value. DECODE replaces any specified value by desired value and can be chained. Your usage is equivalent, ... ... <看更多>
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NVL replaces NULL by specified value. DECODE replaces any specified value by desired value and can be chained. Your usage is equivalent, ... ... <看更多>
I'm talking about the Oracle and Informix (perhaps some others too) function used to filter out non NULL values from query results (similar to COALESCE in other ... ... <看更多>
def first_non_nil(*args). self.each do |element|. return element unless element.nil? end. nil. end. # Alias for the Oracle folks. def nvl. first_non_nil. ... <看更多>