Which two statements are true about single row functions? A.FLOOR: retums the smallest integer greater than or equal to a specified number. B.CEIL: can be used for positive and negative numbers 向上获取整数，正数负数都可以 C.CONCAT: can be used to combine any number of values 只支持两个字符串拼接 D.TRUNC: can be used only with NUMBER data types.日期也可以 E.MOD: returns the remainder of a division operation division 答案： BE