sql - 将 IN 子查询重写为连接

Question

有人可以帮我吗？有没有办法将以下 IN 子查询重写为连接？任何帮助深表感谢。

SELECT DISTINCT 
    p.processID
    ,p.processName
    ,p.highLevelOrder
FROM 
    tblProcess p
WHERE
    p.highLevel = 1 and processID 
    in (select processID from tblJobCPR, tblJobTracking where tblJobCPR.cprID = tblJobTracking.cprID and tblJobTracking.effectiveEnd >= @processDate)
ORDER BY 
    p.highLevelOrder

Answer 1

这应该这样做：

SELECT DISTINCT 
    p.processID
    ,p.processName
    ,p.highLevelOrder
FROM 
    tblProcess p
INNER JOIN tblJobCPR jc
    ON p.processID = jc.processID
INNER JOIN tblJobTracking jt
    ON jc.cprID = jt.cprID
WHERE
    p.highLevel = 1 
    AND jt.effectiveEnd >= @processDate 
ORDER BY 
    p.highLevelOrder

Answer 2

如果列processID在tblJobCPR表中，请尝试以下方式：

SELECT DISTINCT 
    p.processID
    ,p.processName
    ,p.highLevelOrder
FROM 
    tblProcess p
JOIN tblJobCPR j       on  j.processID = p.processID
JOIN tblJobTracking jt on  j.cprID = jt.cprID 
                       and jt.effectiveEnd >= @processDate
WHERE
    p.highLevel = 1 
ORDER BY 
    p.highLevelOrder