ceiling()
函数说明
ceiling(X) 函数返回不小于 X 的最小整数。ceil()
同义。
函数语法
> ceiling(X)
参数释义
参数 | 说明 |
---|---|
X | 必要参数,可取任意数值数据类型 |
对 int 类的绝对数值类型,返回值也是相同的绝对数值类型。对浮点数来说,返回值也是浮点数。
示例
drop table if exists t1;
create table t1(a int ,b float);
insert into t1 values(1,0.5);
insert into t1 values(2,0.499);
insert into t1 values(3,0.501);
insert into t1 values(4,20.5);
insert into t1 values(5,20.499);
insert into t1 values(6,13.500);
insert into t1 values(7,-0.500);
insert into t1 values(8,-0.499);
insert into t1 values(9,-0.501);
insert into t1 values(10,-20.499);
insert into t1 values(11,-20.500);
insert into t1 values(12,-13.500);
mysql> select a,ceiling(b) from t1;
+------+------------+
| a | ceiling(b) |
+------+------------+
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 21 |
| 5 | 21 |
| 6 | 14 |
| 7 | -0 |
| 8 | -0 |
| 9 | -0 |
| 10 | -20 |
| 11 | -20 |
| 12 | -13 |
+------+------------+
12 rows in set (0.00 sec)
mysql> select sum(ceiling(b)) from t1;
+-----------------+
| sum(ceiling(b)) |
+-----------------+
| 6 |
+-----------------+
1 row in set (0.01 sec)