SQLite选择多组行

Question

我正在使用SQLite，尝试选择多组行。例如：

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USER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

平均和精益：

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

Answer 2

<强> Please learn Aggregate function for SQL Lite

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

<强> SQL FIDDLE

Answer 3

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

信息表

<强>结果

Answer 4

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