我需要進行性能調整通過刪除「或」語句性能優化我的SQL查詢,刪除或聲明
請幫助下面的SQL查詢...
SELECT a.id, a.fileType, a.uploadTime, a.filename, a.userId, a.CID, ui.username, company.name companyName, a.screenName
FROM TM_transactionLog a, TM_userInfo ui, TM_company company, TM_airlineCompany ac
WHERE
(
a.CID = 3049
)
OR
(
a.CID = company.ID
AND
ac.SERVICECID = 3049
AND
company.SPECIFICCID = ac.ID
)
OR
(
a.USERID = ui.ID
AND
ui.CID = 3049
);