# **CEIL()**

## **函数说明**

CEIL(X) 函数返回不小于 X 的最小整数。

## **函数语法**

```text
> CEIL(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**

```text
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,ceil(b) from t1;
+------+---------+
| a    | ceil(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 (0.01 sec)

mysql> select sum(ceil(b)) from t1;
+--------------+
| sum(ceil(b)) |
+--------------+
|            6 |
+--------------+
1 row in set (0.01 sec)
```