mysql-向上,向下,四舍五入-取整函数
```
mysql> select ceil(2.44),round(2.44),floor(2.44);
+------------+-------------+-------------+
| ceil(2.44) | round(2.44) | floor(2.44) |
+------------+-------------+-------------+
| 3 | 2 | 2 |
+------------+-------------+-------------+
1 row in set (0.00 sec)
mysql> select ceil(2.55),round(2.55),floor(2.55);
+------------+-------------+-------------+
| ceil(2.55) | round(2.55) | floor(2.55) |
+------------+-------------+-------------+
| 3 | 3 | 2 |
+------------+-------------+-------------+
1 row in set (0.00 sec)
```
**其中ceil为向上取整，round为四舍五入取整，floor为向下取整。**
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