SQL：内部和左侧加入多部分标识符错误

Question

我有两个像这样的查询;

SELECT j.ID, j.Pkey, j.SUMMARY, j.CREATED, j.RESOLUTIONDATE 
     ,j2.SUMMARY, j2.CREATED, j2.RESOLUTIONDATE, j3.SUMMARY, j3.CREATED, j3.RESOLUTIONDATE 
FROM Jira.jiraissue As j 
INNER JOIN Jira.issuelink i 
    ON i.SOURCE =j.ID and i.SEQUENCE = 0 
INNER JOIN Jira.jiraissue As j2 
    ON i.DESTINATION =j2.ID 
LEFT JOIN Jira.issuelink i2 
    ON i2.SOURCE = j.ID and i2.SEQUENCE = 1 
LEFT JOIN Jira.jiraissue As j3 
    ON i2.DESTINATION = j3.ID 

This works great。但是当我尝试实现（在内部连接部分之后）到另一个查询时，出现错误。

SELECT A.pkey as KREDİ, A.SUMMARY , B.pname AS STATU, D.Sorumlu AS SORUMLU, A.CREATED, A.RESOLUTIONDATE, dbo.CUSTVAL(11931, A.ID, 'S') AS BAYİ, dbo.GetLastStatuTime(A.ID) AS SON_STATU_TAR,j2.SUMMARY, j2.CREATED,j2.UPDATED, j2.RESOLUTIONDATE, j3.SUMMARY, j3.CREATED, j3.UPDATED, j3.RESOLUTIONDATE 
FROM Jira.jiraissue A, jira.issuestatus B, AspNetServicesDB.dbo.STATU_MAP D 
INNER JOIN Jira.issuelink i 
    ON i.SOURCE = A.ID and i.SEQUENCE = 0 
INNER JOIN Jira.jiraissue As j2 
    ON i.DESTINATION =j2.ID 
LEFT JOIN Jira.issuelink i2 
    ON i2.SOURCE = A.ID and i2.SEQUENCE = 1 
LEFT JOIN Jira.jiraissue As j3 
    ON i2.DESTINATION = j3.ID 
WHERE A.issuestatus = B.ID 
AND 'BAŞARAN OTOMOTİV' = dbo.CUSTVAL(11931, A.ID, 'S') 
AND B.pname = D.JiraStatu collate Turkish_CS_AI 
AND A.issuetype != 11 

我只能改变j.ID到A.ID。错误信息是;

The multi-part identifier "A.ID" could not be bound. 
Msg 4104, Level 16, State 1, Line 8 
The multi-part identifier "A.ID" could not be bound. 

我不明白为什么。一个意思是Jira.jiraissue表有ID列。为什么j.ID在第一个查询中起作用，但在第二个查询中不起作用A.ID？

Answer 1

不同的是FROM子句中的多表中的第二个查询：

FROM Jira.jiraissue A, (
    jira.issuestatus B, (
     AspNetServicesDB.dbo.STATU_MAP D 
     INNER JOIN Jira.jiraissue As j2 ON i.DESTINATION =j2.ID 
    ) 
) 

在最里面的级别，A没有定义，所以你得到：

FROM Jira.jiraissue A, jira.issuestatus B, AspNetServicesDB.dbo.STATU_MAP D 
INNER JOIN Jira.jiraissue As j2 ON i.DESTINATION =j2.ID 

这被作为执行一个错误。