MySQL 查询一次选择一批行
mysqlmysqli database更新于 2024/2/9 14:51:00
为此，您可以使用 LIMIT 和 OFFSET 的概念。让我们首先创建一个表 −
mysql> create table DemoTable1514 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> FirstName varchar(20) -> ); Query OK, 0 rows affected (0.63 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1514(FirstName) values('Chris');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable1514(FirstName) values('Bob');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1514(FirstName) values('Sam');
Query OK, 1 row affected (0.08 sec)
mysql> insert into DemoTable1514(FirstName) values('Mike');
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable1514(FirstName) values('Carol');
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable1514(FirstName) values('David');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1514(FirstName) values('Robert');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable1514(FirstName) values('Adam');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1514(FirstName) values('John');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable1514(FirstName) values('Jace');
Query OK, 1 row affected (0.13 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1514;
这将产生以下输出 −
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | Chris | | 2 | Bob | | 3 | Sam | | 4 | Mike | | 5 | Carol | | 6 | David | | 7 | Robert | | 8 | Adam | | 9 | John | | 10 | Jace | +----+-----------+ 10 rows in set (0.00 sec)
以下查询一次选择一批行 −
mysql> select * from DemoTable1514 limit 4 offset 4;
这将产生以下输出 −
+----+-----------+ | Id | FirstName | +----+-----------+ | 5 | Carol | | 6 | David | | 7 | Robert | | 8 | Adam | +----+-----------+ 4 rows in set (0.00 sec)
