Mysql 从数据表中为组数据选择最小最大值

嗨，我有这样的数据表

nickname  date         is_unique
test      01-01-2016   yes 
test      01-02-2016   yes 
test      01-03-2016   yes  
test1     01-01-2016   yes 
test1     01-02-2016   yes 
test1     01-03-2016   yes    

我尝试将数据分组以显示如下数据

nickname  startdate    enddate        is_unique
test      01-01-2016   01-03-2016     yes 
test1     01-01-2016   01-03-2016     yes 

但当我使用查询代码min max时，它只显示1列数据是“test”，而不显示“test1”的数据 这是我的sqlquery命令

SELECT b.nickname, min(a.date), max(a.date), a.is_unique 
FROM `table1` a 
join `table2` b 
on b.fingerid = a.acno
where a.is_unique = 1

---

只需在查询中添加

groupby b.nickname

，如下所示

  SELECT b.nickname, min(a.date), max(a.date), a.is_unique 
        FROM `table1` a 
        join `table2` b 
        on b.fingerid = a.acno
        where a.is_unique = 1
        GROUP BY b.nickname

---

只需在查询中添加

groupby b.nickname

，如下所示

  SELECT b.nickname, min(a.date), max(a.date), a.is_unique 
        FROM `table1` a 
        join `table2` b 
        on b.fingerid = a.acno
        where a.is_unique = 1
        GROUP BY b.nickname