Question

我有一张包含客户ID和购买日期的表格，我按客户分组，但我希望上次购买日期不显示第一个购买日期

我试过

GROUP BY客户

ORDER BY已购买DESC

Answer 1

您需要哪个购买日期？如果上次购买日期，那么查询应该是这样的：

SELECT *, max(purchasedate) FROM table1 GROUP BY customer

Answer 2

您需要发布您的实际查询以及我们的上下文，以便更好地为您提供帮助。

好像你错过了聚合。你可以试试这个：

SELECT customer, MAX(purchasedate)
FROM sparkles
GROUP BY customer

Answer 3

如果没有看到您的实际查询，您可以使用与此类似的内容：

select t1.customerid, t1.purchasedate, t1.othercol1, t1.othercol2, t1.othercol3
from yourtable t1
inner join
(
    select max(purchasedate) purchasedate, customerid
    from yourtable
    group by customerid
) t2
    on t1.customerid = t2.customerid
    and t1.purchasedate = t2.purchasedate
order by t1.purchasedate desc

或者您可以将max()汇总功能应用于purchasedate列

Group By / Order By mysql

3 个答案: