Mysql 按范围选择和分组

我有一些数据如下：

+----+--------+-------+
| id | height | width |
+----+--------+-------+
|  1 |   1000 |   300 |
|  2 |   1024 |   330 |
|  3 |    600 |   200 |
|  4 |    624 |   311 |
|  5 |    724 |   511 |
|  6 |    300 |   200 |
+----+--------+-------+

Count how many rows have a height between 0 and 400, between 401 and 600, between 601 and 1000, and 1000+

+-------+---------+----------+-------+
| 0-400 | 401-600 | 601-1000 | 1000+ |
+-------+---------+----------+-------+
|     1 |       1 |        3 |     1 |
+-------+---------+----------+-------+

select sum(if(height<400,1,0)) '<400', sum(if(height>=400 and height<600,1,0)) '400-600'...

有更多的行

我想运行一个查询，该查询执行以下操作：

+----+--------+-------+
| id | height | width |
+----+--------+-------+
|  1 |   1000 |   300 |
|  2 |   1024 |   330 |
|  3 |    600 |   200 |
|  4 |    624 |   311 |
|  5 |    724 |   511 |
|  6 |    300 |   200 |
+----+--------+-------+

Count how many rows have a height between 0 and 400, between 401 and 600, between 601 and 1000, and 1000+

+-------+---------+----------+-------+
| 0-400 | 401-600 | 601-1000 | 1000+ |
+-------+---------+----------+-------+
|     1 |       1 |        3 |     1 |
+-------+---------+----------+-------+

select sum(if(height<400,1,0)) '<400', sum(if(height>=400 and height<600,1,0)) '400-600'...

在这种情况下，我希望它返回如下内容：

+----+--------+-------+
| id | height | width |
+----+--------+-------+
|  1 |   1000 |   300 |
|  2 |   1024 |   330 |
|  3 |    600 |   200 |
|  4 |    624 |   311 |
|  5 |    724 |   511 |
|  6 |    300 |   200 |
+----+--------+-------+

Count how many rows have a height between 0 and 400, between 401 and 600, between 601 and 1000, and 1000+

+-------+---------+----------+-------+
| 0-400 | 401-600 | 601-1000 | 1000+ |
+-------+---------+----------+-------+
|     1 |       1 |        3 |     1 |
+-------+---------+----------+-------+

select sum(if(height<400,1,0)) '<400', sum(if(height>=400 and height<600,1,0)) '400-600'...

我将对范围进行硬编码

---

目前，我正计划为每个范围运行一个查询，有没有更好的方法？

尝试以下方法：

+----+--------+-------+
| id | height | width |
+----+--------+-------+
|  1 |   1000 |   300 |
|  2 |   1024 |   330 |
|  3 |    600 |   200 |
|  4 |    624 |   311 |
|  5 |    724 |   511 |
|  6 |    300 |   200 |
+----+--------+-------+

Count how many rows have a height between 0 and 400, between 401 and 600, between 601 and 1000, and 1000+

+-------+---------+----------+-------+
| 0-400 | 401-600 | 601-1000 | 1000+ |
+-------+---------+----------+-------+
|     1 |       1 |        3 |     1 |
+-------+---------+----------+-------+

select  sum(case when height between 0 and 400 then 1 end) as [0-400]
,       sum(case when height between 401 and 600 then 1 end) as [401-600]
,       ...
from    YourTable

select sum(if(height<400,1,0)) '<400', sum(if(height>=400 and height<600,1,0)) '400-600'...

---

选择sum（如果（高度=400，高度），尝试以下方法：

+----+--------+-------+
| id | height | width |
+----+--------+-------+
|  1 |   1000 |   300 |
|  2 |   1024 |   330 |
|  3 |    600 |   200 |
|  4 |    624 |   311 |
|  5 |    724 |   511 |
|  6 |    300 |   200 |
+----+--------+-------+

Count how many rows have a height between 0 and 400, between 401 and 600, between 601 and 1000, and 1000+

+-------+---------+----------+-------+
| 0-400 | 401-600 | 601-1000 | 1000+ |
+-------+---------+----------+-------+
|     1 |       1 |        3 |     1 |
+-------+---------+----------+-------+

select sum(if(height<400,1,0)) '<400', sum(if(height>=400 and height<600,1,0)) '400-600'...

select sum（if（height=400和heightThank，我知道这一定很简单！@RichBradshaw：实际上可能更容易。在MySQL中，布尔值在大多数（如果不是全部）上下文中都会隐式转换为整数。因此，您可以直接将布尔表达式用作
sum
s:
sum（高度介于0和400之间）的参数
，
SUM（height>1000）
等等。谢谢，我知道这必须很简单！@RichBradshaw：实际上更容易。在MySQL中，布尔值在大多数（如果不是全部）上下文中都会隐式转换为整数。因此，您可以直接将布尔表达式用作
SUM
s:
SUM（height介于0和400之间）的参数
，
总和（高度>1000）
等。