SQL：内部和左联接与多部分标识符错误

Question

我有两个这样的查询；

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

这很好用。但是当我尝试（在内部连接部分之后）对另一个查询实施时，我得到了一个错误。

  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

我只将j.ID 更改为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。表示Jira.jiraissue 表有ID 列。为什么j.ID 在第一个查询中有效，而A.ID 在第二个查询中无效？

Answer 1

不同之处在于第二个查询中的多表 from 子句：

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

这被执行为：

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

在最内层，A 没有定义，所以会出错。