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法律学在 MySQL 中跳过每 2 行后选择下一行
要跳过行，您可以使用 OFFSET。我们首先创建一个表 -
mysql> create table DemoTable617(Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,FirstName varchar(100)); Query OK, 0 rows affected (1.70 sec)
使用 insert 命令在表中插入一些记录 -
mysql> insert into DemoTable617(FirstName) values('John');
Query OK, 1 row affected (0.39 sec)
mysql> insert into DemoTable617(FirstName) values('Sam');
Query OK, 1 row affected (0.39 sec)
mysql> insert into DemoTable617(FirstName) values('Carol');
Query OK, 1 row affected (0.24 sec)
mysql> insert into DemoTable617(FirstName) values('Mike');
Query OK, 1 row affected (0.34 sec)
mysql> insert into DemoTable617(FirstName) values('David');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable617(FirstName) values('Bob');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable617(FirstName) values('Robert');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable617(FirstName) values('Chris');
Query OK, 1 row affected (0.27 sec)
mysql> insert into DemoTable617(FirstName) values('Mike');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable617(FirstName) values('Adam');
Query OK, 1 row affected (0.49 sec)使用 select 语句从表中显示所有记录 -
mysql> select *from DemoTable617;
这将产生以下输出 -
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | John | | 2 | Sam | | 3 | Carol | | 4 | Mike | | 5 | David | | 6 | Bob | | 7 | Robert | | 8 | Chris | | 9 | Mike | | 10| Adam | +----+-----------+ 10 rows in set (0.00 sec)
以下是选择行的查询。首先按 DESC 排序。然后，它将跳过两行，并使用 LIMIT 5 显示 5 行 -
mysql> select tbl.* from (select *from DemoTable617 order by FirstName DESC LIMIT 5 OFFSET 2) AS tbl ORDER BY tbl.Id ;
这将产生以下输出 -
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | John | | 4 | Mike | | 5 | David | | 8 | Chris | | 9 | Mike | +----+-----------+ 5 rows in set (0.00 sec)
更新于： 23-8-2019
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