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法律研究如何在 MySQL 中使用 LIMIT 選擇第一行和最後一行記錄？
我們首先建立一個表。建立表的查詢如下
mysql> create table FirstAndLastDataDemo -> ( -> EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> EmployeeName varchar(20), -> EmployeeAge int -> ); Query OK, 0 rows affected (0.59 sec)
使用 insert 命令在表中插入一些記錄。查詢如下
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('John',23);
Query OK, 1 row affected (0.15 sec)
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('Bob',13);
Query OK, 1 row affected (0.11 sec)
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('Larry',24);
Query OK, 1 row affected (0.14 sec)
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('Sam',14);
Query OK, 1 row affected (0.18 sec)
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('Mike',31);
Query OK, 1 row affected (0.10 sec)
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge)
values('James',18);
Query OK, 1 row affected (0.16 sec)
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge)
values('Maxwell',28);
Query OK, 1 row affected (0.17 sec)
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('David',27);
Query OK, 1 row affected (0.12 sec)
mysql> insert into FirstAndLastDataDemo(EmployeeName,EmployeeAge) values('Chris',22);
Query OK, 1 row affected (0.19 sec)使用 select 語句顯示錶中的所有記錄。
mysql> select *from FirstAndLastDataDemo;
以下是輸出
+------------+--------------+-------------+ | 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 獲取第一行和最後一行記錄，查詢如下
mysql> (SELECT *from FirstAndLastDataDemo LIMIT 1) -> UNION -> (SELECT *from FirstAndLastDataDemo LIMIT 8,1);
以下是顯示第一行和最後一行記錄的輸出
+------------+--------------+-------------+ | EmployeeId | EmployeeName | EmployeeAge | +------------+--------------+-------------+ | 1 | John | 23 | | 9 | Chris | 22 | +------------+--------------+-------------+ 2 rows in set (0.00 sec)
更新於：30-7-2019
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