MySQL查询在SELECT语句中生成行索引（行）？
要生成行索引，请使用ROW_NUMBER()。让我们首先创建一个表-
create table DemoTable ( Name varchar(40) );
使用插入命令在表中插入一些记录-
insert into DemoTable values('Chris');
insert into DemoTable values('Chris');
insert into DemoTable values('Chris');
insert into DemoTable values('Robert');
insert into DemoTable values('Robert');
insert into DemoTable values('Adam');
insert into DemoTable values('Adam');
insert into DemoTable values('Adam');
insert into DemoTable values('Adam');使用select语句显示表中的所有记录-
select *from DemoTable;
这将产生以下输出-
+--------+ | Name | +--------+ | Chris | | Chris | | Chris | | Robert | | Robert | | Adam | | Adam | | Adam | | Adam | +--------+ 9 rows in set (0.00 sec)
以下是在MySQLSELECT语句中生成行索引的查询。在这里，我们为重复名称设置了等级-
select Name, row_number() over (partition by Name) as `Rank` from DemoTable;
这将产生以下输出-
+--------+------+ | Name | Rank | +--------+------+ | Adam | 1 | | Adam | 2 | | Adam | 3 | | Adam | 4 | | Chris | 1 | | Chris | 2 | | Chris | 3 | | Robert | 1 | | Robert | 2 | +--------+------+ 9 rows in set (0.00 sec)