如何在MySQL中使用LIMIT选择第一行和最后一行记录？

让我们首先创建一个表。创建表的查询如下

mysql> create table FirstAndLastDataDemo
   -> (
   -> EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> EmployeeName varchar(20),
   -> EmployeeAge int
   -> );

使用insert命令在表中插入一些记录。查询如下

mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('John',23);
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('Bob',13);
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('Larry',24);
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('Sam',14);
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('Mike',31);
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge)
values('James',18);
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge)
values('Maxwell',28);
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('David',27);
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('Chris',22);

使用select语句显示表中的所有记录。

mysql> select *from FirstAndLastDataDemo;

以下是输出

+------------+--------------+-------------+
| EmployeeId | EmployeeName | EmployeeAge |
+------------+--------------+-------------+
| 1          | John         | 23          |
| 2          | Bob          | 13          |
| 3          | Larry        | 24          |
| 4          | Sam          | 14          |
| 5          | Mike         | 31          |
| 6          | James        | 18          |
| 7          | Maxwell      | 28          |
| 8          | David        | 27          |
| 9          | Chris        | 22          |
+------------+--------------+-------------+
9 rows in set (0.00 sec)

要使用LIMIT获取第一行和最后一行记录，以下是查询

mysql> (SELECT *from FirstAndLastDataDemo LIMIT 1)
   -> UNION
   -> (SELECT *from FirstAndLastDataDemo LIMIT 8,1);

以下是显示第一行和最后一行记录的输出

+------------+--------------+-------------+
| EmployeeId | EmployeeName | EmployeeAge |
+------------+--------------+-------------+
| 1          | John         | 23          |
| 9          | Chris        | 22          |
+------------+--------------+-------------+
2 rows in set (0.00 sec)