mysql 將多個查詢結果合并成一行

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mysql中的多行查詢結果合并成一個SELECT GROUP_CONCAT(md.data1) FROM DATA md,contacts cc WHERE md.conskey=cc.id AND md.mimetype_id= 5 AND md.user_id=17：利用函數：group_concat(),實現一個ID對應多個名稱時，原本為多行資料，把名稱合并成一行，如|1 | 10,20,20| 本文通過執行個體介紹了MySQL中的group_concat函數的使用方法，比如select group_concat(name) 。MySQL中group_concat函數完整的文法如下：group_concat([DISTINCT] 要串連的欄位 [Order BY ASC/DESC 排序欄位] [Separator ‘分隔字元‘])基本查詢 mysql> select * from aa;+------+------+| id| name |+------+------+|1 | 10||1 | 20||1 | 20||2 | 20||3 | 200 ||3 | 500 |+------+------+6 rows in set (0.00 sec)以id分組，把name欄位的值列印在一行，逗號分隔(預設) mysql> select id,group_concat(name) from aa group by id;+------+--------------------+| id| group_concat(name) |+------+--------------------+|1 | 10,20,20||2 | 20 ||3 | 200,500|+------+--------------------+3 rows in set (0.00 sec)以id分組，把name欄位的值列印在一行，分號分隔 mysql> select id,group_concat(name separator ‘;‘) from aa group by id;+------+----------------------------------+| id| group_concat(name separator ‘;‘) |+------+----------------------------------+|1 | 10;20;20 ||2 | 20||3 | 200;500 |+------+----------------------------------+3 rows in set (0.00 sec)以id分組，把去冗餘的name欄位的值列印在一行， 逗號分隔mysql> select id,group_concat(distinct name) from aa group by id;+------+-----------------------------+| id| group_concat(distinct name) |+------+-----------------------------+|1 | 10,20||2 | 20 ||3 | 200,500 |+------+-----------------------------+3 rows in set (0.00 sec)以id分組，把name欄位的值列印在一行，逗號分隔，以name排倒序 mysql> select id,group_concat(name order by name desc) from aa group by id;+------+---------------------------------------+| id| group_concat(name order by name desc) |+------+---------------------------------------+|1 | 20,20,10 ||2 | 20||3 | 500,200|+------+---------------------------------------+3 rows in set (0.00 sec)

 

mysql 將多個查詢結果合并成一行