将 max(count) 和 min(count) 添加到查询中

Question

我正在尝试将最大值和最小值添加到以下查询中：

SELECT category, COUNT(distinct VIN) COUNT
FROM stock
group by category
order by category ASC

期望的结果是显示计数中项目最多的类别和计数中项目最少的类别。

当前输出：

CATEGORY COUNT
Sedan    25
SUV      15
TRUCK    15
AWD      10

期望的输出：

CATEGORY COUNT
Sedan    25
AWD      10

我基本上想显示最大数量，在此示例中为 SEDAN，最小类别数量为 AWD

我认为这需要一个带有嵌套子查询的 HAVING 语句，我们将非常感谢您的帮助

我正在使用 Oracle 11g

Answer 1

select 
   count(VIN), 
   Category 
from STOCK
having count(VIN)=
    (
        select max(count(VIN))  
        from STOCK group by project_status_id 
    )
    OR count(project_status_id)=
    (
        select min(count(project_status_id))  
        from project_status group by project_status_id 
     )
group by project_status_id

Answer 2

我能想到的最好的方法是联合两个查询来找到最大和最小计数，如下所示：

Select category, CNT
FROM
(SELECT category, COUNT(distinct VIN) CNT
FROM stock
group by category
Order by CNT asc) a
where RowNum = 1
UNION
Select category, CNT
FROM
(SELECT category, COUNT(distinct VIN) CNT
FROM stock
group by category
Order by CNT desc) a
where RowNum = 1

SQL Fiddle: http://www.sqlfiddle.com/#!4/555515/18/0

Answer 3

select count(VIN), Category 
from STOCK
having count(VIN)=(select max(count(VIN)) from STOCK group by Category )
OR count(VIN)=(select min(count(VIN))  from STOCK group by Category )
group by Category;

Answer 4

SQL Fiddle

Oracle 11g R2 架构设置:

CREATE TABLE counts ( CATEGORY, "COUNT" ) AS
          SELECT 'Sedan',    25 FROM DUAL
UNION ALL SELECT 'SUV',      15 FROM DUAL
UNION ALL SELECT 'TRUCK',    15 FROM DUAL
UNION ALL SELECT 'AWD',      10 FROM DUAL;

查询 1:

SELECT MAX( CATEGORY ) KEEP ( DENSE_RANK LAST ORDER BY "COUNT" ASC ) AS CATEGORY,
       MAX( "COUNT" ) AS "COUNT"
FROM   COUNTS
UNION ALL
SELECT MIN( CATEGORY ) KEEP ( DENSE_RANK FIRST ORDER BY "COUNT" ASC ) AS CATEGORY,
       MIN( "COUNT" ) AS "COUNT"
FROM   COUNTS

Results:

| CATEGORY | COUNT |
|----------|-------|
|    Sedan |    25 |
|      AWD |    10 |

将 max(count) 和 min(count) 添加到查询中

Adding max(count) and min(count) to query

sql

max

min

oracle11g