MySQL中group_concat函数,连接字段，多个值显示为一行_MySQL

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MySQL中group_concat函数,连接字段，多个值显示为一行

 

Sql代码      

MySQL中group_concat函数  

完整的语法如下：  

group_concat([DISTINCT] 要连接的字段 [Order BY ASC/DESC 排序字段] [Separator '分隔符'])  

  

基本查询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分组，把name字段的值打印在一行，逗号分隔(默认)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分组，把name字段的值打印在一行，分号分隔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分组，把去冗余的name字段的值打印在一行，逗号分隔  

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分组，把name字段的值打印在一行，逗号分隔，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)  

 

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