MySQL查詢速度很慢時，將子查詢

Question

我有以下查詢，只有800記錄服用5個minits運行，可你一些幫助，請

SELECT 

vtiger_salesorder.salesorderid,vtiger_salesorder.salesorder_no,vtiger_salesorder.sostatus, 
(SELECT se.s_date 
FROM 
softMax_events as se 
INNER JOIN vtiger_salesorder as bm ON bm.salesorderid = se.orderNum 
where (bm.sostatus = 'Order' AND se.orderNum = vtiger_salesorder.salesorderid) AND se.appointTyp='60' 
group by bm.salesorderid Limit 0,1) As sdate 

FROM 
    vtiger_salesorder 
Inner Join vtiger_crmentity ON vtiger_salesorder.salesorderid = vtiger_crmentity.crmid 
WHERE (vtiger_salesorder.sostatus = 'Order') 
and (vtiger_crmentity.deleted<>'1') 

Answer 1

嘗試此查詢，希望是這樣，這將幫助你，

SELECT vtiger_salesorder.salesorderid,vtiger_salesorder.salesorder_no,vtiger_salesorder.sostatus,se.s_date 
    FROM vtiger_salesorder 
    Inner Join vtiger_crmentity ON vtiger_salesorder.salesorderid = vtiger_crmentity.crmid 
    INNER JOIN softMax_events se ON se.orderNum = salesorderid 
    WHERE (vtiger_salesorder.sostatus = 'Order') AND/OR 
    se.orderNum = vtiger_salesorder.salesorderid AND se.appointTyp='60' 
    and (vtiger_crmentity.deleted<>'1') 

編輯： 我注意到，有vtiger_salesorder and softMax_events之間的一些關係，你可以使用這兩個表的連接，並以這種方式，你可以刪除內部查詢，我想它可能會對其進行測試。這將有助於你確定一些修改後。