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MySQL查询一次选择一行

2024-05-09 20:20:04 383

为此，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)
   -> );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable1514(FirstName) values('Chris');
mysql> insert into DemoTable1514(FirstName) values('Bob');
mysql> insert into DemoTable1514(FirstName) values('Sam');
mysql> insert into DemoTable1514(FirstName) values('Mike');
mysql> insert into DemoTable1514(FirstName) values('Carol');
mysql> insert into DemoTable1514(FirstName) values('David');
mysql> insert into DemoTable1514(FirstName) values('Robert');
mysql> insert into DemoTable1514(FirstName) values('Adam');
mysql> insert into DemoTable1514(FirstName) values('John');
mysql> insert into DemoTable1514(FirstName) values('Jace');

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)

这是一次选择一批的查询-

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)

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MySQL查询一次选择一行

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