-- select MOD(65,50) from dual --取余
-- select trunc( 65/33) from dual -- 取整 trunc (1.9) = 1
-- select ceil(65/60) from dual -- 取整 ceil(1.1) = 2
-- select trunc( 65/33) from dual -- 取整 trunc (1.9) = 1
-- select ceil(65/60) from dual -- 取整 ceil(1.1) = 2