sql - SQLite 选择多组行

Question

我正在使用 SQLite，试图选择多组行。例子：

RowID  USER  Event
------------------
1      Sam   eventX  
2      Sam   eventY
3      Sam   eventA
4      John  E1
5      John  E5
6      Lisa  ev3
7      Lisa  ev4
8      Lisa  ev3

我想为每个用户选择一个条目，即具有最高 rowid 的条目。结果集应如下所示：

RowID  USER  Event
------------------
3      Sam   eventA
5      John  E5
8      Lisa  ev3

请帮忙。

Answer 1

Mean and lean:

SELECT * FROM Table1 WHERE RowID IN (
    SELECT MAX(RowID) FROM Table1 GROUP BY User
);

Answer 2

select max(RowID),User,Event from Info group by User order by max(RowID)

信息表

结果

Answer 3

请学习 SQL Lite 的聚合函数

select max(RowID) as RowID,User,Event
from Table1
group by User
order by max(RowID)

SQL 小提琴

Answer 4

SELECT rowid, user, event FROM table WHERE rowid IN (SELECT MAX(rowid) FROM table GROUP BY user);