这是我的table logs :

id    package    log
====================
0     first      log0
1     first      log1
2     second     log2

我希望查询结果如下：

package    count    last_log_id
===============================
first      2        1
second     1        2

到目前为止，我的搜索结果是：

SELECT package, COUNT(*) FROM logs GROUP BY package

这有助于我按包裹计算每组的数量。

SELECT a1.package, COUNT(*),a1.id 
FROM logs a1 LEFT JOIN logs a2 
ON (a1.package = a2.package AND a1.id < a2.id) 
WHERE a2.id IS NULL 
GROUP BY a1.package

这有助于我获得最后一个日志的id，但计数是错误的！

package    count    last_log_id
===============================
first      1        1
second     1        2