MySQL：选择id为最后一条记录的组的计数

这是我的名为“日志”的表：

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

我希望查询结果如下所示：

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

---

我认为您的第一次尝试是正确的，您可以使用

MAX

功能查找每个包的最新日志

id

：

SELECT
    package,
    COUNT(*) AS count,
    MAX(id) AS last_log_id
FROM logs
GROUP BY package;

SELECT
    package,
    COUNT(*) AS count,
    MAX(id) AS last_log_id
FROM logs
GROUP BY package;