如何从MySQL表中获取新添加的记录?
为此,您可以将ORDER BY与LIMIT一起使用。在这里,LIMIT用于设置要获取的记录的限制(计数)。让我们首先创建一个表-
mysql> create table DemoTable1486-> (
-> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> StudentName varchar(20)
-> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable1486(StudentName) values('Chris Brown');mysql> insert into DemoTable1486(StudentName) values('David Miller');
mysql> insert into DemoTable1486(StudentName) values('John Doe');
mysql> insert into DemoTable1486(StudentName) values('John Smith');
mysql> insert into DemoTable1486(StudentName) values('Adam Smith');
mysql> insert into DemoTable1486(StudentName) values('Carol Taylor');
使用select语句显示表中的所有记录-
mysql> select * from DemoTable1486;
这将产生以下输出-
+-----------+--------------+| StudentId | StudentName |
+-----------+--------------+
| 1 | Chris Brown |
| 2 | David Miller |
| 3 | John Doe |
| 4 | John Smith |
| 5 | Adam Smith |
| 6 | Carol Taylor |
+-----------+--------------+
6 rows in set (0.00 sec)
这是获取新添加的记录的查询-
mysql> select * from DemoTable1486-> order by StudentId desc
-> limit 3;
这将产生以下输出-
+-----------+--------------+| StudentId | StudentName |
+-----------+--------------+
| 6 | Carol Taylor |
| 5 | Adam Smith |
| 4 | John Smith |
+-----------+--------------+
3 rows in set (0.00 sec)
以上是 如何从MySQL表中获取新添加的记录? 的全部内容, 来源链接: utcz.com/z/347228.html