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法律研究在 MySQL 中获取特定限制后的有序记录
为此，你可以使用子查询。首先，让我们创建一个表 -
mysql> create table DemoTable618 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,StudentFirstName varchar(100) ); Query OK, 0 rows affected (1.45 sec)
使用插入命令在表中插入一些记录 -
mysql> insert into DemoTable618(StudentFirstName) values('David');
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable618(StudentFirstName) values('Chris');
Query OK, 1 row affected (0.44 sec)
mysql> insert into DemoTable618(StudentFirstName) values('Robert');
Query OK, 1 row affected (0.54 sec)
mysql> insert into DemoTable618(StudentFirstName) values('Sam');
Query OK, 1 row affected (0.24 sec)
mysql> insert into DemoTable618(StudentFirstName) values('Mike');
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable618(StudentFirstName) values('Carol');
Query OK, 1 row affected (0.28 sec)
mysql> insert into DemoTable618(StudentFirstName) values('Bob');
Query OK, 1 row affected (3.66 sec)
mysql> insert into DemoTable618(StudentFirstName) values('John');
Query OK, 1 row affected (0.17 sec)使用选择语句从表中显示所有记录 -
mysql> select *from DemoTable618;
这将产生以下输出 -
+-----------+------------------+ | StudentId | StudentFirstName | +-----------+------------------+ | 1 | David | | 2 | Chris | | 3 | Robert | | 4 | Sam | | 5 | Mike | | 6 | Carol | | 7 | Bob | | 8 | John | +-----------+------------------+ 8 rows in set (0.00 sec)
以下是获取特定限制后的有序记录的查询 -
mysql> select *from (select StudentId,StudentFirstName from DemoTable618 where StudentId >= 5 order by StudentId limit 4) tbl order by tbl.StudentId desc;
这将产生以下输出 -
+-----------+------------------+ | StudentId | StudentFirstName | +-----------+------------------+ | 8 | John | | 7 | Bob | | 6 | Carol | | 5 | Mike | +-----------+------------------+ 4 rows in set (0.00 sec)
更新日期：2019 年 8 月 23 日
83 次浏览
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