这是我的查询:
select top 5 cast(content_html as xml) as [prodxml],
prodxml.value('data(ClassTemplate[1]', 'nvarchar(max) ') as prod2
from content
where
end_date >= getdate()
and folder_id != 71682
我一直在接受:
Msg 4121, Level 16, State 1, Line 1
Cannot find either column "prodxml" or the user-defined function or aggregate "prodxml.value", or the name is ambiguous.
我做错了什么?
答案 0 :(得分:3)
我无法直接查询prod1,我怎样才能找到所有包含“其他”作为类模板的记录?
您不能在同一SELECT语句的另一列中引用列别名 - 使用:
SELECT TOP 5
CAST(t.content_html AS XML).value('(/root/ClassTemplate)[1]', 'NVARCHAR(max)') AS prod2
FROM CONTENT t
WHERE t.end_date >= getdate()
AND t.folder_id != 71682
如果要根据WHERE子句中的prod2值过滤掉 - 请使用:
FROM CONTENT t
WHERE CAST(t.content_html AS XML).value('(/root/ClassTemplate)[1]', 'NVARCHAR(max)') = 'Other'
AND t.end_date >= getdate()
AND t.folder_id != 71682