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多表联查
select g.number,p.name,p.nowCost,u.realname,u.phone from wb_barter_goods as g left join wb_barter_users as u on g.usersId = u.id left join wb_barter_product as p on p.id = g.productId
where u.id = 1
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原文地址：http://www.cnblogs.com/linglingyang/p/4709059.html
