MySQL查询一次选择一行
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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