Question

我需要一些帮助...

我有2个内部sql服务器，一个包含学生信息，第二个包含库存。

我想要做的是将两者链接在一起并从“userfile”服务器获取额外的表。

下面是我从学生信息中提取的sql的一部分，我知道它有效。

fyi，sql的第一部分工作 - 我从SQL的第一部分得到了所有表，但没有得到第二部分（和 PupilPersonalDetails.PupilID内连接[MYSERVERNAME] .USERFILE.dbo.pupil on PupilID = user_file_userid）

感谢您的帮助

includeNonActive

Answer 1

请像这样写清楚

请测试以下

从[win2k12sql.USERFILE.dbo.pupil中选择*，其中pupilID = NumberYouKnowExists其中（＆＃39;％wc％＆＃39; =＆＃39;％wc％＆＃39;）

SELECT CurrentPupil.SchoolID as 'SchoolID', CurrentPupil.PupilID as 
'PupilID', PupilPersonalDetails.Surname as 'Surname', 
PupilPersonalDetails.Forename as 'First_Name',
PupilCurrentSchoolYearGroupLookupDetails.Description as 'Year_Group' 

FROM CurrentPupil 

LEFT OUTER JOIN PupilPersonalDetails AS PupilPersonalDetails ON
 CurrentPupil.SchoolID = PupilPersonalDetails.SchoolID AND 
CurrentPupil.PupilID = PupilPersonalDetails.PupilID 

LEFT OUTER JOIN PupilCurrentSchool AS 
PupilCurrentSchool ON CurrentPupil.SchoolID = PupilCurrentSchool.SchoolID 

AND 

CurrentPupil.PupilID = PupilCurrentSchool.PupilID 

LEFT OUTER JOIN LookupDetails  AS PupilCurrentSchoolYearGroupLookupDetails 
ON 
PupilCurrentSchoolYearGroupLookupDetails.LookupDetailsID = 
PupilCurrentSchool.YearGroup 

AND 

PupilCurrentSchoolYearGroupLookupDetails.LookupID = '3004' 

AND

 PupilPersonalDetails.PupilID    --do you have an issue here?

inner join [win2k12sql].USERFILE.dbo.pupil on 
PupilID = user_file_userid  

 WHERE ('%wc%' = '%wc%')

Answer 2

如果您使用了一些别名，那么您的查询将更容易使用。公平地说，您的代码中有很多别名，但别名与表名相同。这就像是说我的名字是“Sean Lange”，也被称为“Sean Lange”。我喜欢使用相当短的别名，然后尽可能保持它们在查询之间保持一致。

也不要使用字符串文字作为别名。它会工作，但它增加了混乱，更多的击键和零利益。除非您希望列的名称在结果集中不同，否则不需要列上的别名。

只需一些别名并格式化文本墙，查询就变得很容易看到发生了什么。所有整理你的查询可能看起来像这样。

SELECT
    cp.SchoolID
    , cp.PupilID
    , ppd.Surname
    , ppd.Forename AS First_Name
    , pcsygld.Description AS Year_Group
FROM CurrentPupil cp
LEFT OUTER JOIN PupilPersonalDetails AS ppd ON cp.SchoolID = ppd.SchoolID 
                                        AND cp.PupilID = ppd.PupilID
LEFT OUTER JOIN PupilCurrentSchool AS pcs ON cp.SchoolID = pcs.SchoolID 
                                        AND cp.PupilID = pcs.PupilID
LEFT OUTER JOIN LookupDetails AS pcsygld ON pcsygld.LookupDetailsID = pcs.YearGroup
                                        AND pcsygld.LookupID = '3004'
                                        AND ppd.PupilID = cp.PupilID --you were missing cp.PupilID
INNER JOIN win2k12sql.USERFILE.dbo.pupil p ON p.PupilID = user_file_userid
WHERE ('%wc%' = '%wc%') --This doesn't make any sense. You are comparing two string literals.

连接到不同服务器的表

2 个答案: