Question

我有2列

Item    |   Category

Apple      Fruit
Orange     Fruit
Potatoes   Vegetables

必需的输出：

水果

我试图在数量方面得到最高类别的名称，即Fruit。我写了一个可以在MySql上运行的MySql查询。但是同样的查询会在MS SQL Server上引发错误。任何提示都将不胜感激。

select Cat from (select count(category) as Total,category as cat from test group by category) as S1 group by S1.Total,S1.Cat having max(s1.total)

运行时我得到一个空的结果。但我创建的类似查询在MySql上运行正常：

SELECT s2.cats FROM (SELECT s1.cat AS cats, max(s1.counts) AS countings FROM (SELECT count(category) AS counts, category AS cat from test GROUP BY category) AS s1) AS s2

我得到的错误信息是：消息4145，级别15，状态1，行1 在预期条件的上下文中指定的非布尔类型的表达式，接近＆＃39;。＆＃39;。

我想避免使用TOP

Answer 1

这样的东西？相当丑陋，但避免顶部。此外，将返回所有具有最大计数的项目，而不仅仅是任意项目。

假设表[食物]的列类别为：

select category from Food group by Category having COUNT(*) = 
(select max(cnt) from (select COUNT(*) as cnt from Food group by Category) subq)

MS SQL有子句问题

1 个答案: