SELECT ABS(-9) AS 绝对值
SELECT CEILING(9.4) AS 向上取整
SELECT FLOOR(9.23) AS 向上取整
SELECT RAND() -- AS 随机数(0_1之间)
SELECT SIGN(0) AS 符号函数 -- 负数返回-1
SELECT ABS(-9) AS 绝对值
SELECT CEILING(9.4) AS 向上取整
SELECT FLOOR(9.23) AS 向上取整
SELECT RAND() -- AS 随机数(0_1之间)
SELECT SIGN(0) AS 符号函数 -- 负数返回-1