ceil

description

Syntax

BIGINT ceil(DOUBLE x)

如果不指定d: 返回大于或等于x的最大整数值, 这也是最常见的用法. 否则, 按照下面规则返回最小的大于或者等于x的舍入数字:

如 d 是字面量（不是列）:
d = 0: 等同于没有 d d > 0 or d < 0: 舍入数是 1/(10^d) 的倍数，如果 1/(10^d) 不精确，则为相应数据类型的最接近的数字。

如果 d 为一个列，并且第一个参数为 Decimal 类型，那么结果 Decimal 会跟入参 Decimal 具有相同的小数部分长度。

提示

该函数的其他别名为 dceil 和 ceiling。

example

mysql> select ceil(1);
+-----------+
| ceil(1.0) |
+-----------+
|         1 |
+-----------+
mysql> select ceil(2.4);
+-----------+
| ceil(2.4) |
+-----------+
|         3 |
+-----------+
mysql> select ceil(-10.3);
+-------------+
| ceil(-10.3) |
+-------------+
|         -10 |
+-------------+
mysql> select ceil(123.45, 1), ceil(123.45), ceil(123.45, 0), ceil(123.45, -1);
+-----------------+--------------+-----------------+------------------+
| ceil(123.45, 1) | ceil(123.45) | ceil(123.45, 0) | ceil(123.45, -1) |
+-----------------+--------------+-----------------+------------------+
|           123.5 |          124 |             124 |              130 |
+-----------------+--------------+-----------------+------------------+
mysql> SELECT number
    -> , ceil(number * 2.5, number - 1) AS c_decimal_column
    -> , ceil(number * 2.5, 0) AS c_decimal_literal
    -> , ceil(cast(number * 2.5 AS DOUBLE), number - 1) AS c_double_column
    -> , ceil(cast(number * 2.5 AS DOUBLE), 0) AS c_double_literal
    -> FROM test_enhanced_round
    -> WHERE rid = 1;
+--------+------------------+-------------------+-----------------+------------------+
| number | c_decimal_column | c_decimal_literal | c_double_column | c_double_literal |
+--------+------------------+-------------------+-----------------+------------------+
|      1 |              3.0 |                 3 |               3 |                3 |
+--------+------------------+-------------------+-----------------+------------------+

keywords

CEIL, DCEIL, CEILING