更高效的T-SQL語句

Question

美好的一天，

在我們使用SQL作爲我們的數據庫爲我們Solarwinds的產品，我已經寫了一個查詢那只是下面，我只是想知道是否有更有效的時刻執行查詢的方式。

這裏發生了什麼是我們得到不同的值被監測的設備，如果一個條件已經改變，然後提醒它看起來只是WHERE子句是矯枉過正。

所以我想要的是如果AssignmentName = x，如果currentvalue不= ='y'值然後警報。

FROM 
CustomPollerStatus INNER JOIN CustomPollerAssignmentView ON    CustomPollerStatus.CustomPollerAssignmentID = CustomPollerAssignmentView.CustomPollerAssignmentID 
LEFT OUTER JOIN CustomPollers ON CustomPollerAssignmentView.CustomPollerID =  CustomPollers.CustomPollerID 
LEFT OUTER JOIN Nodes ON CustomPollerAssignmentView.NodeID = Nodes.NodeID) 

where AssignmentName = 'a' and currentvalue != '24' 
and AssignmentName = 'b' and currentvalue != '1' 
and AssignmentName = 'c' and currentvalue != 'RUN' 
and AssignmentName = 'd' and currentvalue != 'RUN' 
and AssignmentName = 'e' and currentvalue != '72' 
and AssignmentName = 'f' and currentvalue != '30' 
and AssignmentName = 'g' and currentvalue != '72' 
and AssignmentName = 'h' and currentvalue != '30' 
and AssignmentName = 'i' and currentvalue != '276' 
and AssignmentName = 'j' and currentvalue != '72' 

我是新來的TSQL任何知識將是創造

Answer 1

我猜你更高效的查詢很大的原意是要寫

SELECT * 

FROM CustomPollerStatus 
    INNER JOIN CustomPollerAssignmentView ON CustomPollerStatus.CustomPollerAssignmentID = CustomPollerAssignmentView.CustomPollerAssignmentID 
    LEFT OUTER JOIN CustomPollers ON CustomPollerAssignmentView.CustomPollerID = CustomPollers.CustomPollerID 
    LEFT OUTER JOIN Nodes ON CustomPollerAssignmentView.NodeID = Nodes.NodeID) 

where (AssignmentName = 'a' and currentvalue != '24') 
    OR (AssignmentName = 'b' and currentvalue != '1') 
    OR (AssignmentName = 'c' and currentvalue != 'RUN') 
    OR (AssignmentName = 'd' and currentvalue != 'RUN') 
    OR (AssignmentName = 'e' and currentvalue != '72') 
    OR (AssignmentName = 'f' and currentvalue != '30') 
    OR (AssignmentName = 'g' and currentvalue != '72') 
    OR (AssignmentName = 'h' and currentvalue != '30') 
    OR (AssignmentName = 'i' and currentvalue != '276') 
    OR (AssignmentName = 'j' and currentvalue != '72') 

也許你的意思

... 
WHERE (AssignmentName IN ('a','b', 'c', 'd', 'e', 'f','g', 'h','i','j') 
    AND CurrentValue NOT IN ('24', '1','RUN','72','30''276') 

無論哪種方式查詢不會更有效率。如果你有性能問題，我會查看你的索引。