如何在 MySQL 中按 auto_increment 排序?
mysqlmysqli database
首先我们创建一个表 −
mysql> create table DemoTable(Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,FirstName varchar(100)); Query OK, 0 rows affected (0.70 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable(FirstName) values('Chris');
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable(FirstName) values('Robert');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(FirstName) values('David');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(FirstName) values('Mike');
Query OK, 1 row affected (0.24 sec)
mysql> insert into DemoTable(FirstName) values('Adam');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(FirstName) values('Carol');
Query OK, 1 row affected (0.12 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
这将产生以下输出 −
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | Chris | | 2 | Robert | | 3 | David | | 4 | Mike | | 5 | Adam | | 6 Carol | +----+-----------+ 6 rows in set (0.00 sec)
以下是按 auto_increment 排序的查询 −
mysql> select *from DemoTable order by Id DESC;
这将产生以下输出 −
+----+-----------+ | Id | FirstName | +----+-----------+ | 6 | Carol | | 5 | Adam | | 4 | Mike | | 3 | David | | 2 | Robert | | 1 | Chris | +----+-----------+ 6 rows in set (0.00 sec)
