mysql查询问题

select com from(SELECT shipping_fedex, sum( goods_amount2 ) AS com
FROM bids_buy_info
GROUP BY shipping_fedex
) where com=0

希望将这个com=0的查询出来，正确的语句怎么写？

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SELECT shipping_fedex, sum( goods_amount2 ) AS com
FROM bids_buy_info
GROUP BY shipping_fedex having com = 0