如何在以下两个查询

Question

我的第一个问题是：

SELECT SUM(expenses.amount) as project_expenses 
FROM expenses 
WHERE project_id=$project_id

我的第二个问题是：

    SELECT customer_deal.*,recipt_no_agency.*,expense_type.exp_head,project.name,
    expenses.type_id ,SUM(recipt_no_agency.payment) as pay 
    FROM customer_deal 
    LEFT JOIN project ON customer_deal.project_id=project.project_id 
    LEFT JOIN recipt_no_agency ON recipt_no_agency.recipt_id=customer_deal.id     
    LEFT JOIN expenses ON expenses.project_id=customer_deal.id 
    LEFT JOIN expense_type ON expenses.type_id=customer_deal.id 
    WHERE project.project_id=$project_id

请帮忙。