MySQL内部连接与MAX（日期）和分组[重复]

Question

我有一个 MySQL 数据库 8.0，其结构如下：

Table1: Child
Id | Name   | EnrolmentId
1  | Nathan | 12345ABC
2  | James  | 56789BCD

Table2 : Enrolments
Id | EnrolmentId |StartDate |  Status | DateUpdated
1  | 12345ABC    |2021-12-01| PENDING | 2021-06-08T02:13:24
2  | 12345ABC    |2021-12-01| CONFIRM | 2021-12-15T04:56:45
3  | 56789BCD    |2021-12-02| CREATED | 2021-06-09T02:13:24
4  | 56789BCD    |2021-12-02| CONFIRM | 2021-12-16T04:56:45

我只想显示每个注册的 1 行及其最新注册状态。

EnrolmentID | Name   | StartDate |  Status | DateUpDated
12345ABC    | Nathan |2021-12-01 | CONFIRM | 2021-12-15T04:56:45
56789BCD    | James  |2021-12-02 | CONFIRM | 2021-12-16T04:56:45   

我正在使用以下查询：

 SELECT e.enrolmentId,c.Name,e.startDate, e.Status,e.DateUpdated
    FROM child c INNER JOIN enrolment e ON c.EnrolmentId = e.enrolmentid
    GROUP BY e.enrolmentid ORDER BY c.Name; 

它工作正常，但因为我的数据库在 Azure MySQL 8.0xx 中，并且根据其他建议，我已将 sql_mode 的服务器参数设置为 full_group_by 为 off，但在重新启动 MySQL 服务器之前我仍然随机出现此错误。以下是我得到的错误。

"Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column
'mydatbase.c.Name' which is not functionally dependent on columns in GROUP BY clause;this is incompatible with sql_mode=only_full_group_by

有什么方法可以重写它，使它对 MySQL 8.0 友好。

Answer 1

WITH cte AS (
    SELECT *, ROW_NUMBER() OVER (PARTITION BY EnrolmentId ORDER BY e.DateUpdated DESC) rn
    FROM child c 
    INNER JOIN enrolment e USING (EnrolmentId)
)
SELECT * 
FROM cte
WHERE rn = 1
ORDER BY Name;

当然，用明确的列列表替换星号（不明确的Id - 分配适当的别名）。