MySQL查询两个字段一起在结果

Question

所以，我有如下表：

retailer register store 
1   104   b 
1   101   a 
2   104   b 
2   101   a 
3   104   b 
3   101   a 

我找表中查询得到的结果，看起来像：

retailer register store 
1 _ 101, 104 _ a, b 
2 _ 101, 104 _ a, b 
3 _ 101, 104 _ a, b 

Answer 1

您可以使用GROUP_CONCAT和group by

select 
    retailer 
, group_concat(register ORDER BY registed ASC SEPARATOR ', ') 
, group_concat(store ORDER BY store ASC SEPARATOR ', ') 
from my_table 
group by retailer 

，如果你需要的saparator你应该使用CONCAT

select 
     concat (retailer 
     , '_' 
     , group_concat(register ORDER BY registed ASC SEPARATOR ', ') 
     , '_' 
     , group_concat(store ORDER BY store ASC SEPARATOR ', ')) 
from my_table 
group by retailer 

Answer 2

您可以通过和GROUP_CONCAT与ORDER使用GROUP BY和分隔符

select retailer, 
GROUP_CONCAT(register ORDER BY register DESC SEPARATOR ', ') AS register, 
GROUP_CONCAT(store ORDER BY store DESC SEPARATOR ', ') AS store 
from my_table 
GROUP BY retailer 

retailer register store 
    1  101, 104 a, b 
    2  101, 104 a, b 
    3  101, 104 a, b