GROUP_CONCAT订购

我有一张桌子，像：

+-----------+-------+------------+
| client_id | views | percentage |
+-----------+-------+------------+
|         1 |     6 |         20 |
|         1 |     4 |         55 |
|         1 |     9 |         56 |
|         1 |     2 |         67 |
|         1 |     7 |         80 |
|         1 |     5 |         66 |
|         1 |     3 |         33 |
|         1 |     8 |         34 |
|         1 |     1 |         52 |

我试过了group_concat：

SELECT li.client_id, group_concat(li.views) AS views,  
group_concat(li.percentage) FROM li GROUP BY client_id;

+-----------+-------------------+-----------------------------+
| client_id | views             | group_concat(li.percentage) |
+-----------+-------------------+-----------------------------+
|         1 | 6,4,9,2,7,5,3,8,1 | 20,55,56,67,80,66,33,34,52  |
+-----------+-------------------+-----------------------------+

但我想按顺序获取视图，例如：

+-----------+-------------------+----------------------------+
| client_id | views             | percentage                 |
+-----------+-------------------+----------------------------+
|         1 | 1,2,3,4,5,6,7,8,9 | 52,67,33,55,66,20,80,34,56 |
+-----------+-------------------+----------------------------+

您可以通过以下方式ORDER BY在GROUP_CONCAT函数内部使用：

SELECT li.client_id, group_concat(li.percentage ORDER BY li.views ASC) AS views, 
group_concat(li.percentage ORDER BY li.percentage ASC) 
FROM li GROUP BY client_id

group_concat支持其自己的order by子句

http://mahmudahsan.wordpress.com/2008/08/27/mysql-the-group_concat-function/

因此，您应该能够编写：

SELECT li.clientid, group_concat(li.views order by views) AS views,
group_concat(li.percentage order by percentage) 
FROM table_views GROUP BY client_id

尝试

SELECT li.clientid, group_concat(li.views ORDER BY li.views) AS views,
       group_concat(li.percentage ORDER BY li.percentage) 
FROM table_views li 
GROUP BY client_id

http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function%5Fgroup-concat

在IMPALA中，在Coders'Co处没有GROUP_CONCAT的订单可能会造成问题。我们有一些解决方法（对于Rax / Impala我们需要它）。如果您需要IMPALA中带有ORDER BY子句的GROUP_CONCAT结果，请查看此博客文章：http : //raxdb.com/blog/sorting-by-regex/