php - SQL : Can’t grab values in descending order when using group by

Question

我正在使用以下查询连接两个表并从中检索值。它按降序显示值。

Leads
63697       Ben
63698       Ben
63699       Ben
63700       Ben
63701       Ben


log

2   63697       Ben         10%     Qualifying
3   63697       Ben         20%     Qualifying
4   63697       Ben         30%     Qualifying
6   63698       Ben         30%     Qualifying
8   63698       Ben     80%     Quoted
10  63698       Ben         70%     Quoted

我要展示，

63697       Ben         30%     Qualifying
63698       Ben         70%     Quoted
63699       Ben
63700       Ben
63701       Ben

问题是当我使用查询时，

SELECT leads.id,leads.name, log.prob, log.current_stage FROM leads LEFT JOIN log ON log.leadid = leads.id WHERE leads.name = '$name' ORDER BY log.id DESC

它按降序显示日志表的所有详细信息。但是当我尝试将它们分组时，

SELECT leads.id,leads.name, log.prob, log.current_stage FROM leads LEFT JOIN log ON log.leadid = leads.id WHERE leads.name = '$name' GROUP BY log.leadid ORDER BY log.id DESC

它从日志表中按升序获取值

63697       Ben         10%     Qualifying
63698       Ben         30%     Qualifying
63699       Ben
63700       Ben
63701       Ben

谁能告诉我我做错了什么？

Answer 1

SELECT * FROM (
SELECT leads.id,leads.name, log.prob, log.current_stage, log.id AS logid FROM leads LEFT JOIN log ON log.leadid = leads.id WHERE leads.name = '$name' GROUP BY log.leadid
) ORDER BY logid DESC

经常看到这种情况，只需将其包装在 super 查询中，如图所示。