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round

round

description

Syntax

T round(T x[, d])x四舍五入后保留d位小数,d默认为0。如果d为负数,则小数点左边d位为0。如果x或d为null,返回null。

提示

该函数的另一个别名为 dround

example

mysql> select round(2.4);
+------------+
| round(2.4) |
+------------+
| 2 |
+------------+
mysql> select round(2.5);
+------------+
| round(2.5) |
+------------+
| 3 |
+------------+
mysql> select round(-3.4);
+-------------+
| round(-3.4) |
+-------------+
| -3 |
+-------------+
mysql> select round(-3.5);
+-------------+
| round(-3.5) |
+-------------+
| -4 |
+-------------+
mysql> select round(1667.2725, 2);
+---------------------+
| round(1667.2725, 2) |
+---------------------+
| 1667.27 |
+---------------------+
mysql> select round(1667.2725, -2);
+----------------------+
| round(1667.2725, -2) |
+----------------------+
| 1700 |
+----------------------+

keywords

ROUND, DROUND