SELECT seller.id, ( 6371 * acos( cos( radians('$lat') ) * cos( radians( seller.latitude ) ) *
cos( radians( seller.longitude ) - radians('$log') ) + sin( radians('$lat') ) *
sin( radians( seller.latitude ) ) ) ) AS distance ,products.*
 from seller  LEFT JOIN products on seller.id=products.user_id where products.user_id=$sellerid

我想从卖方表中得到卖方，从卖方距离小于25或其他的产品表中得到卖方与其产品的距离
怎么做？请帮忙