php - Sum of left join tables -

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i have 3 tables in mysql database. jobrequest- jobno, vehicleno labour- date, jobno4, amount2 materialcost date, jobno2, amount3 when user select jobno jobrequest table, want display total of labourcost , materialcost..... here code

$result = mysql_query(" select jobrequest.jobno,jobrequest.vehicleno, sum(amount2) amount2, sum(amount3) amount3, jobrequest left join materialcost on jobrequest.jobno = materialused.jobno2 left join labour on jobrequest.jobno = labour.jobno4 ( jobrequest.jobno = '$item1') "); 

select  jobrequest.jobno, jobrequest.vehicleno,  sum(amount2) amount2, sum(amount3) amount3  jobrequest  left join materialcost  on jobrequest.jobno = materialused.jobno2   left join labour on jobrequest.jobno = labour.jobno4   ( jobrequest.jobno = '$item1')  group jobrequest.jobno, jobrequest.vehicleno

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