mysql 查询大数据导出都是怎么作的?

SELECT a.goods_sn, b.goods_id, b.img_original, b.thumb_url, FROM_UNIXTIME(a.add_time) FROM eload_goods a RIGHT JOIN eload_goods_gallery b ON a.goods_id = b.goods_id WHERE from_unixtime(a.add_time) >=

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