原创 row_number()、rank()、dense_rank()這三個分析函數的區別實例
SQL> select region_id, customer_id, sum(customer_sales) total, 2 rank() over(order by sum(customer_sales) desc
SQL> select region_id, customer_id, sum(customer_sales) total, 2 rank() over(order by sum(customer_sales) desc