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mysql 数值处理函数floor与round

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2016-06-07 15:07:131423browse

在mysql中,当处理数时,会用到数处理函数,如有一个float型数2.13,你想只要整数2,那就需要下面的函数floor与round。 floor:函数只返回整数部分,小数部分舍弃。 round:函数四舍五入,大于0.5的部分进位,不到则舍弃。与floor不同。如下测试 mysql selec

  在mysql中,当处理数值时,会用到数值处理函数,如有一个float型数值2.13,你想只要整数2,那就需要下面的函数floor与round。

floor:函数只返回整数部分,小数部分舍弃。

round:函数四舍五入,大于0.5的部分进位,不到则舍弃。与floor不同。如下测试

mysql> select floor(5.1);
+------------+
| floor(5.1) |
+------------+
|          5 |
+------------+
1 row in set (0.00 sec)

mysql> select floor(5.5);
+------------+
| floor(5.5) |
+------------+
|          5 |
+------------+
1 row in set (0.00 sec)

mysql> select round(5.2);
+------------+
| round(5.2) |
+------------+
|          5 |
+------------+
1 row in set (0.00 sec)

mysql> select round(5.5);
+------------+
| round(5.5) |
+------------+
|          6 |
+------------+
1 row in set (0.00 sec)





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