mysql之group_concat函數詳解

標籤：

函數文法：

group_concat( [DISTINCT]  要串連的欄位   [Order BY 排序欄位 ASC/DESC]   [Separator ‘分隔字元‘] )

下面舉例說明：

select * from goods;  

+------+------+
| id| price|
+------+------+
|1 | 10|
|1 | 20|
|1 | 20|
|2 | 20|
|3 | 200 |
|3 | 500 |
+------+------+
6 rows in set (0.00 sec)

以id分組，把price欄位的值在同一行列印出來，逗號分隔(預設)

select id, group_concat(price) from goods group by id;  

+------+--------------------+
| id| group_concat(price) |
+------+--------------------+
|1 | 10,20,20|
|2 | 20 |
|3 | 200,500|
+------+--------------------+
3 rows in set (0.00 sec)

以id分組，把price欄位的值在一行列印出來，分號分隔 

select id,group_concat(price separator ‘;‘) from goods group by id;  

+------+----------------------------------+
| id| group_concat(price separator ‘;‘) |
+------+----------------------------------+
|1 | 10;20;20 |
|2 | 20|
|3 | 200;500 |
+------+----------------------------------+
3 rows in set (0.00 sec)

以id分組，把去除重複冗餘的price欄位的值列印在一行，逗號分隔
select id,group_concat(distinct price) from goods group by id;  

+------+-----------------------------+
| id| group_concat(distinct price) |
+------+-----------------------------+
|1 | 10,20|
|2 | 20 |
|3 | 200,500 |
+------+-----------------------------+
3 rows in set (0.00 sec)

以id分組，把price欄位的值列印在一行，逗號分隔，按照price倒序排列
select id,group_concat(price order by price desc) from goods group by id;  

+------+---------------------------------------+
| id| group_concat(price order by price desc) |
+------+---------------------------------------+
|1 | 20,20,10 |
|2 | 20|
|3 | 500,200|
+------+---------------------------------------+
3 rows in set (0.00 sec)

mysql之group_concat函數詳解