左連接表的總和

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我在我的mysql數據庫中有三個表。 jobrequest - jobno，vehicleno 勞動 - 日期，jobno4，AMOUNT2 materialcost日期，jobno2，AMOUNT3 當用戶從jobrequest表中選擇jobno，我想顯示總labourcost和materialcost ..... 的這裏是我的代碼左連接表的總和

$ result = mysql_query（「SELECT jobrequest.jobno，jobrequest.vehicleno，SUM（amount2）AS amount2，SUM（amount3）AS amount3，FROM jobrequest LEFT JOIN materialcost ON jobrequest.jobno = materialused.jobno2左加入勞動on jobrequest.jobno = labour.jobno4 WHERE（jobrequest.jobno ='$ item1'）「）;

來源

2014-02-06 user3089848

SELECT jobrequest.jobno, jobrequest.vehicleno, 
SUM(amount2) AS amount2, SUM(amount3) AS amount3 FROM jobrequest 
LEFT JOIN materialcost ON jobrequest.jobno = materialused.jobno2 
LEFT JOIN labour ON jobrequest.jobno = labour.jobno4 
WHERE (jobrequest.jobno = '$item1') 
group by jobrequest.jobno, jobrequest.vehicleno

來源

2014-02-06 04:20:34 jainvikram444

它的工作，答案是AMOUNT2 = 32868.539＆AMOUNT3 = 19876.不過，正確的答案是AMOUNT2 = 10956.18＆AMOUNT3 = 4969. – user3089848

具有u應用於日期字段一些過濾？ –

他的權利，如果想要一個日期特定的數據然後申請一個filer像：其中（jobrequest.jobno ='$ item1'和labour.date ='$ item2'） – jainvikram444

左連接表的總和

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