php - 如何显示选择计数的最后一行而不是第一行？

Question

我有这个表 calls

id | clientid | salespersonid | duration | statusid | last_update
1  | c11      | sp99          | 05:00    | 1        | yyyy
2  | c11      | sp99          | 06:00    | 1        | yyyy
3  | c11      | sp99          | 07:00    | 3        | yyyy
4  | c12      | sp99          | 08:00    | 3        | yyyy

我执行此查询是为了计算每个销售人员的每个客户的调用次数

select *,count(wpc.id) as num_of_calls 
                                    from calls wpc
                                    where wpc.salespersonid=?
                                    group by wpc.clientid
                                    order by wpc.last_update desc

这将返回此结果

id | clientid | salespersonid | duration | statusid | last_update|num_of_calls
1  | c11      | sp99          | 05:00    | 1        | yyyy       |3
4  | c12      | sp99          | 08:00    | 3        | yyyy       |1

查询很好，但我对程序计算和显示行的顺序不满意。它显示计数的第一行。我希望它显示每个计数的最后一行。

所以结果应该是

id | clientid | salespersonid | duration | statusid | last_update|num_of_calls
3  | c11      | sp99          | 07:00    | 3        | yyyy       |3
4  | c12      | sp99          | 08:00    | 3        | yyyy       |1

如何显示每个计数的最后一行而不是第一行？

Answer 1

Using ORDER BY and GROUP BY together 的重复项

使用解决方案:https://stackoverflow.com/a/35053900/2397717

 SELECT wpc.*, COUNT(wpc.id) AS num_of_calls FROM (SELECT * FROM calls ORDER BY last_update DESC) as wpc GROUP BY wpc.clientid