mysql多条相同连接的数据合并一条函数

mysql的函数GROUP_CONCAT，用a.`goods_id` group by开 SELECT a.`goods_id`,GROUP_CONCAT(b.`stock`) FROM t_product a  LEFT JOIN t_stock_format b  ON a.`goods_id` = b.`goods_id`  GROUP BY a.`goods_id`

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