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法律學在 MySQL 中跳過每 2 行後選擇下一行
要跳過行，您可以使用 OFFSET。我們首先建立一個表 -
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記錄 -
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 語句從表中顯示所有記錄 -
mysql> select *from DemoTable617;
這將產生以下輸出 -
+----+-----------+ | 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)
以下是選擇行的查詢。首先按 DESC 排序。然後，它將跳過兩行，並使用 LIMIT 5 顯示 5 行 -
mysql> select tbl.* from (select *from DemoTable617 order by FirstName DESC LIMIT 5 OFFSET 2) AS tbl ORDER BY tbl.Id ;
這將產生以下輸出 -
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | John | | 4 | Mike | | 5 | David | | 8 | Chris | | 9 | Mike | +----+-----------+ 5 rows in set (0.00 sec)
更新於： 23-8-2019
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