MySql查詢問題上次在數據庫中找到的記錄

Question

我有這個問題：

  SELECT device, COUNT(*) 
    FROM database.table 
GROUP BY device 
  HAVING count(*) > 1 
ORDER BY device;

我需要做的是添加一個列，顯示設備上次連接到數據庫的時間。

該表的結構如下：

ID, device(string),
data1(int),data2(int), 
time(timestamp), 
data3(int),
data4(int)

謝謝

Answer 1

  select device, count(*) as cnt, max(time) <-- same as latest time
    from database.table 
group by device
  having cnt>1
order by device;