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選擇數據我有選擇查詢如下選擇查詢與聯接是慢慢地從數據庫中的Android
SELECT DISTINCT tt.firstname,
tt.lastname,
tc.caseid,
tt.courtcode AS courtid,
tcou.courtname,
(SELECT COUNT(*)
FROM tblcasetrafficticketlink
WHERE caseid = tc.caseid) AS ticketcount,
Max(tt.violationdate) AS violationdate,
(tt.address1
|| ','
|| tt.address2) AS address,
tt.city,
tt.state,
tt.zip,
tt.dob,
tt.sex
FROM tblcase tc
LEFT OUTER JOIN tblcasetrafficticketlink tcttl
ON tc.caseid = tcttl.caseid
LEFT OUTER JOIN tbltraffictickets tt
ON tcttl.courtid = tt.courtcode
AND tt.ticketnumber = tcttl.ticketnumber
AND (tcttl.ticketextension = tt.ticketnumberex
OR tt.ticketnumberex IS NULL)
LEFT OUTER JOIN tblcourts tcou
ON tcou.courtid = tt.courtcode
WHERE tc.casetype = 'TRAFFIC'
AND tc.caseid<='"+recent_min_caseID+"'
GROUP BY tc.caseid,
tt.firstname,
tt.lastname,
tt.dob,
tt.sex,
tt.courtcode,
tcou.courtname,
tt.city,
tt.state,
tt.zip,
tc.casestatus,
tt.address1,
tt.address2
ORDER BY tc.caseid DESC
LIMIT 100;
這是需要很長時間來獲取數據。任何人都可以幫助提高性能。這裏PRAGMA很有用嗎?如果是的話如何?如果沒有,告訴我解決這個問題的方法。
時間取決於您從數據庫中獲取多少數據,當數據從數據庫加載時,您可以設置進度對話框。 – Hasmukh 2012-03-27 12:31:34
感謝您的回覆Mr.Hasmukh完全選擇記錄需要4-5秒我想減少那個時間 – user1108995 2012-03-27 12:41:29
我有3個表每個表有近4000條記錄和15列如何加入這些表,我想在從數據庫中檢索數據獲得快速響應。 – user1108995 2012-03-27 12:48:58