Question

我的SQL查询如下：

select CategoryID, Name, count(Name) as C 
from Posts 
where CategoryID=1101 and Language=1 
group by CategoryID 
order by C ASC;

我需要获取按名称分组的最短名称，任何想法？

如果没有给出CategoryID（NULL），那么另一件事情就会很好。该组不包括。

Answer 1

这样可以解决问题：

SELECT
  CategoryID,
  SUBSTRING_INDEX(GROUP_CONCAT(Name ORDER BY LENGTH(Name)), ',', 1) As s_name,
  Count(Name) as C,
FROM
  Posts 
WHERE
  CategoryID=1101 and Language=1 
GROUP BY CategoryID 
ORDER BY C ASC;

Answer 2

您可以按length(Name)排序并限制为1来执行此操作。

select CategoryID, Name, count(Name) as C 
from Posts where CategoryID is not null and Language=1 
group by CategoryID order by length(Name) asc limit 1;

添加CategoryID IS NOT NULL以排除NULL值。

按最小长度分组

2 个答案: