MySQL查询返回重复行

Question

我有一张像下面这样的mytable桌；

╔═════════╦══════╦═════╗
║ product ║ tag  ║ lot ║
╠═════════╬══════╬═════╣
║ 1111    ║ 101  ║ 2   ║ 
║ 1111    ║ 102  ║ 5   ║ 
║ 2222    ║ 103  ║ 6   ║ 
║ 3333    ║ 104  ║ 2   ║  
║ 4444    ║ 101  ║ 2   ║ 
║ 5555    ║ 101  ║ 2   ║ 
║ 5555    ║ 102  ║ 5   ║ 
║ 6666    ║ 102  ║ 2   ║ 
║ 6666    ║ 103  ║ 5   ║
║ 7777    ║ 101  ║ 2   ║ 
║ 7777    ║ 102  ║ 5   ║ 
║ 7777    ║ 103  ║ 6   ║ 
║ 8888    ║ 101  ║ 1   ║ 
║ 8888    ║ 102  ║ 3   ║ 
║ 8888    ║ 103  ║ 5   ║ 
║ 9999    ║ 101  ║ 6   ║ 
║ 9999    ║ 102  ║ 8   ║
╚═════════╩══════╩═════╝

我有输入101，102。我想要的输出像；

2,5
6,8

我有一个疑问，好像；

select group_concat(lot order by lot)
from `mytable`
group by product
having group_concat(tag order by tag) = '101,102';

它回来了；

2,5
2,5
6,8

我只想要一个，而不是两个2,5，避免重复的行。我该怎么做？

这是小提琴http://sqlfiddle.com/#!9/7a78bb/1/0

Answer 1

如果你想要distinct

select distinct group_concat(lot order by lot)
from `mytable`
group by product
having group_concat(tag order by tag) = '101,102';

Answer 2

您只需要使用DISTINCT来消除重复项

select DISTINCT group_concat(lot order by lot)
from `mytable`
group by product
having group_concat(tag order by tag) = '101,102';