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)
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