mysql多條相同連接的數據合併一條函數

mysql的函數GROUP_CONCAT，用a.`goods_id` group by開 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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