从desc根据ID排序的表中选择最上面的记录？
为此，将ORDERBYDESC与LIMIT1一起使用。让我们首先创建表-
mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(100), -> UserMessage text -> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable(UserName,UserMessage) values('Adam','Hi');
mysql> insert into DemoTable(UserName,UserMessage) values('Chris','Awesome');
mysql> insert into DemoTable(UserName,UserMessage) values('Robert','Nice');
mysql> insert into DemoTable(UserName,UserMessage) values('David','Good Morning!!!');使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
输出结果
这将产生以下输出-
+----+----------+-----------------+ | Id | UserName | UserMessage | +----+----------+-----------------+ | 1 | Adam | Hi | | 2 | Chris | Awesome | | 3 | Robert | Nice | | 4 | David | Good Morning!!! | +----+----------+-----------------+ 4 rows in set (0.00 sec)
以下是从表中选择最高记录的查询-
mysql> select *from DemoTable order by Id DESC limit 1;
输出结果
这将产生以下输出-
+----+----------+-----------------+ | Id | UserName | UserMessage | +----+----------+-----------------+ | 4 | David | Good Morning!!! | +----+----------+-----------------+ 1 row in set (0.00 sec)