group_concat([DISTINCT] 要连接的字段 [Order BY ASC/DESC 排序字段] [Separator '分隔符'])
SELECT * FROM `sqltest`
如果按照group_id分组,会自动去重
SELECT * FROM `sqltest` GROUP BY group_id
想要类别按组分类集中到一起,就要用Group_concat
SELECT group_id,GROUP_CONCAT(category) FROM `sqltest` GROUP BY group_id
①可以给类别去重
SELECT group_id,GROUP_CONCAT(DISTINCT category) FROM `sqltest` GROUP BY group_id
②给类别排序
SELECT group_id,GROUP_CONCAT(category ORDER BY category DESC) FROM `sqltest` GROUP BY group_id
③给类别更改分隔符
SELECT group_id,GROUP_CONCAT(category SEPARATOR '_') FROM `sqltest` GROUP BY group_id
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