以下是查询:
SELECT c.Name As CompanyName, j.ID as JobID, j.Title as JobTitle,
ja.ApplicationDate, DATEDIFF(MONTH,ja.ApplicationDate, GETDATE()) AS MonthsAgo,
jsc.Name As Recruiter, js.Name As RecruitingAgency, jsh.Name As LastStatus
FROM Companies c
JOIN Jobs j
ON c.ID = j.CompanyID
JOIN JobApplications ja
ON j.ID = ja.JobID
LEFT JOIN JobContact jsc
ON jsc.ID = j.JobSourceContactID
LEFT JOIN JobContactCompany js
ON jsc.JobSourceCompanyID = js.ID
LEFT JOIN (
SELECT TOP 1 jh.JobID, jh.StatusDate, jt.Name
FROM JobStatusHistory jh
JOIN JobStatusTypes jt
ON jh.JobStatusTypeID = jt.ID
--WHERE jh.JobID = j.ID
ORDER BY jh.StatusDate DESC
) jsh
ON j.ID = jsh.JobID
ORDER BY ja.ApplicationDate
我正在尝试获取特定工作的最新工作状态。我无法弄清楚如何在LEFT JOIN中执行where子句(注释的WHERE)。我过去做过这个,但不记得我过去是怎么做过的。
我会感激任何指示。
答案 0 :(得分:5)
您需要使用OUTER APPLY。 CROSS Apply类似于INNER JOIN,其中应用的表必须返回结果,而OUTER Apply类似于[LEFT] OUTER JOIN,其中应用的子查询可能不返回任何结果。
SELECT c.Name As CompanyName, j.ID as JobID, j.Title as JobTitle,
ja.ApplicationDate, DATEDIFF(MONTH,ja.ApplicationDate, GETDATE()) AS MonthsAgo,
jsc.Name As Recruiter, js.Name As RecruitingAgency, jsh.Name As LastStatus
FROM Companies c
JOIN Jobs j ON c.ID = j.CompanyID
JOIN JobApplications ja ON j.ID = ja.JobID
LEFT JOIN JobContact jsc ON jsc.ID = j.JobSourceContactID
LEFT JOIN JobContactCompany js ON jsc.JobSourceCompanyID = js.ID
OUTER APPLY (
SELECT TOP 1 jh.JobID, jh.StatusDate, jt.Name
FROM JobStatusHistory jh
JOIN JobStatusTypes jt
ON jh.JobStatusTypeID = jt.ID
WHERE jh.JobID = j.ID
ORDER BY jh.StatusDate DESC
) jsh
ORDER BY ja.ApplicationDate