微客导航 » 文章资讯 » 如何在MySQL中实现GROUP BY范围？

如何在MySQL中实现GROUP BY范围？

2024-04-28 17:08:04 320

为了在MySQL中按范围分组，让我们首先创建一个表。创建表的查询如下

mysql> create table GroupByRangeDemo
   - > (
   - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   - > YourRangeValue int
   - > );

现在，您可以使用insert命令在表中插入一些记录。

查询如下

mysql> insert into GroupByRangeDemo(YourRangeValue) values(1);
mysql> insert into GroupByRangeDemo(YourRangeValue) values(7);
mysql> insert into GroupByRangeDemo(YourRangeValue) values(9);
mysql> insert into GroupByRangeDemo(YourRangeValue) values(23);
mysql> insert into GroupByRangeDemo(YourRangeValue) values(33);
mysql> insert into GroupByRangeDemo(YourRangeValue) values(35);
mysql> insert into GroupByRangeDemo(YourRangeValue) values(1017);

使用select语句显示表中的所有记录。

查询如下

mysql> select *from GroupByRangeDemo;

以下是输出

+----+----------------+
| Id | YourRangeValue |
+----+----------------+
|  1 |              1 |
|  2 |              7 |
|  3 |              9 |
|  4 |             23 |
|  5 |             33 |
|  6 |             35 |
|  7 |           1017 |
+----+----------------+
7 rows in set (0.04 sec)

这是按范围分组的查询

mysql> select round(YourRangeValue / 10), count(YourRangeValue) from GroupByRangeDemo where YourRangeValue < 40 group by round(YourRangeValue / 10)
   - > union
   - > select '40+', count(YourRangeValue) from GroupByRangeDemo where YourRangeValue >= 40;

以下是输出

+----------------------------+-----------------------+
| round(YourRangeValue / 10) | count(YourRangeValue) |
+----------------------------+-----------------------+
| 0                          |                     1 |
| 1                          |                     2 |
| 2                          |                     1 |
| 3                          |                     1 |
| 4                          |                     1 |
| 40+                        |                     1 |
+----------------------------+-----------------------+
6 rows in set (0.08 sec)

返回顶部
3162201930
czq8825@qq.com

如何在MySQL中实现GROUP BY范围？

热门推荐

随机推荐