[英]SQL 2005: How to use GROUP BY with a sub query
以下非常简单的查询
select distinct guid, browser_agent
from tblMyGlossary
where browser_agent is not null
提供以下结果:
guid browser_agent
367DE2B8-88A5-4DA9-ACBB-C0864493DC1F Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
5DCB918E-DA56-4545-A4E3-D09B1B803422 Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
998B8F37-2C9A-49EB-AA0B-CF88C4CC7BDF Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5
A0DD3BCB-E8A9-4434-A869-C343FB21F993 Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
我希望能够计算唯一的browser_agent字符串的数量,所以我执行以下查询:
select browser_agent, count(browser_agent) as 'count'
from
(
select distinct guid, browser_agent
from tblMyGlossary
where browser_agent is not null
)
group by browser_agent
order by 'count' desc;
问题是SQL 2005抱怨:
消息156,级别15,状态1,行8关键字“组”附近的语法不正确。
任何人都可以解释如何解决这个问题吗? 我已经没想完了。
非常感谢,
标记
您需要为派生表设置别名。
select browser_agent, count(browser_agent) as 'count'
from
(
select distinct guid, browser_agent
from tblMyGlossary
where browser_agent is not null
) a
group by browser_agent
order by 'count' desc;
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