Aster Example: Stratified Sample - Single Fraction
The result of selecting columns from the twm_customer table with the above options selected is that 72 rows are returned (approximately 10%). These include approximately 10% of the overall rows (329) that correspond to gender equals male, and about 9% of the overall rows (418) that correspond to gender equals female. That is, rows corresponding to 33 males and 39 females are returned.