sql - join three tables in firebirdsql -

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i have problem: i'd join 3 table in order values, example:

sellers idsellers nameseller  stock idstock qtystock cost fkseller  sell idsell qtysell price fkseller

i want out total amount of stock , sell tables each seller

u have tried following query doubles values each sell:

select sellers.nameseller, sum(stock.qty*stock.cost)as stocks, sum(sell.qty*sell.price) sells sellers left join stock on stock.fkseller=sellers.idseller left join sell on sell.fkseller=sellers.idsellers group sellers.nameseller

the firebirdsql release in use 2.1

thanks in advance.

the problem if have example 2 in sell , 2 in stock. first join produce 2 records, second join create 2*2 records. instead should union data , join once, or use select expression produce sums.

using select expression:

select   sellers.nameseller,   (select sum(stock.qty * stock.cost)       stock stock.fkseller=sellers.idseller) stocks,   (select sum(sell.qty * sell.price)       sell sell.fkseller=sellers.idsellers) sells sellers

using union:

select    sellers.nameseller,   sum(stocksell.stockqty * stocksell.stockcost) stocks,   sum(stocksell.sellqty * stocksell.sellprice) sells sellers left join (   select fkseller, qty stockqty, cost stockcost,           0 sellqty, 0 sellprice   stock   union   select fkseller, 0 stockqty, 0 stockcost,           qty sellqty, price sellprice   sell ) stocksell   on stocksell.fkseller=sellers.idseller group sellers.nameseller

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