RATIO_TO_REPORT

RATIO_TO_REPORT(COLUMN_EXPRESSION)

Returns an element in the window frame divided by the sum of all elements in the same window frame, or NULL if the window frame has a sum of zero. For example, if calculating RATIO_TO_REPORT on [2, 5, NULL, 10, 3] where the window is the entire partition, the answer is [0.1, 0.25, NULL, 0.5, 0.15].