SqlServerCe精簡版中的查詢優化

Question

我在我的應用程序中使用SqlserverCe精簡版。 我在查詢中使用左連接。 Sqlce需要更多的時間來執行。下面 是代碼

SELECT calllog.consolename AS consolename, 
     COUNT(consolename) AS totalcalls, 
     sub.cnt    AS emergencycalls 
FROM calllog 
     LEFT JOIN (SELECT consolename, 
         COUNT(*) AS cnt 
        FROM calllog 
        WHERE emergencycall = 'False' 
         AND (begintime >= '3/6/2011 10:52:39 AM' 
           AND endtime <= '10/25/2011 6:52:39 PM') 
        GROUP BY consolename) AS sub 
     ON calllog.consolename = sub.consolename 
WHERE (begintime >= '3/6/2011 10:52:39 AM' 
     AND endtime <= '10/25/2011 6:52:39 PM') 
GROUP BY calllog.consolename, 
      sub.cnt 
ORDER BY totalcalls ASC 

請幫助我，我怎麼能避免complexty

Answer 1

確保您擁有的BeginTime，結束時間，EmergencyCall指數等