数据结构
网络
RDBMS
操作系统
Java
MS Excel
iOS
HTML
CSS
Android
Python
C 编程
C++
C#
MongoDB
MySQL
Javascript
PHP
物理
化学
生物
数学
英语
经济学
心理学
社会学
时装学
法律学如何在 MySQL 中使用单个查询找出前一条和后一条记录？
可以使用 UNION 在 MySQL 中获取前一条和后一条记录。
语法如下
(select *from yourTableName WHERE yourIdColumnName > yourValue ORDER BY yourIdColumnName ASC LIMIT 1) UNION (select *from yourTableName WHERE yourIdColumnName < yourValue ORDER BY yourIdColumnName DESC LIMIT 1);
为了理解这个概念，我们先来创建一个表。创建表的查询如下
mysql> create table previousAndNextRecordDemo - > ( - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > Name varchar(30) - > ); Query OK, 0 rows affected (1.04 sec)
为该表插入一些记录，使用 insert 指令。
查询如下
mysql> insert into previousAndNextRecordDemo(Name) values('John'); Query OK, 1 row affected (0.17 sec) mysql> insert into previousAndNextRecordDemo(Name) values('Sam'); Query OK, 1 row affected (0.15 sec) mysql> insert into previousAndNextRecordDemo(Name) values('Carol'); Query OK, 1 row affected (0.14 sec) mysql> insert into previousAndNextRecordDemo(Name) values('Bob'); Query OK, 1 row affected (0.17 sec) mysql> insert into previousAndNextRecordDemo(Name) values('Larry'); Query OK, 1 row affected (0.20 sec) mysql> insert into previousAndNextRecordDemo(Name) values('David'); Query OK, 1 row affected (0.14 sec) mysql> insert into previousAndNextRecordDemo(Name) values('Ramit'); Query OK, 1 row affected (0.12 sec) mysql> insert into previousAndNextRecordDemo(Name) values('Maxwell'); Query OK, 1 row affected (0.15 sec) mysql> insert into previousAndNextRecordDemo(Name) values('Mike'); Query OK, 1 row affected (0.14 sec) mysql> insert into previousAndNextRecordDemo(Name) values('Robert'); Query OK, 1 row affected (0.19 sec) mysql> insert into previousAndNextRecordDemo(Name) values('Chris'); Query OK, 1 row affected (0.10 sec) mysql> insert into previousAndNextRecordDemo(Name) values('James'); Query OK, 1 row affected (0.16 sec) mysql> insert into previousAndNextRecordDemo(Name) values('Jace'); Query OK, 1 row affected (0.15 sec)
使用 select 语句来显示表中的所有记录。
查询如下
mysql> select *from previousAndNextRecordDemo;
输出如下
+----+---------+ | Id | Name | +----+---------+ | 1 | John | | 2 | Sam | | 3 | Carol | | 4 | Bob | | 5 | Larry | | 6 | David | | 7 | Ramit | | 8 | Maxwell | | 9 | Mike | | 10 | Robert | | 11 | Chris | | 12 | James | | 13 | Jace | +----+---------+ 13 rows in set (0.00 sec)
以下查询使用 UNION 单个查询获取前一条和后一条记录
mysql> (select *from previousAndNextRecordDemo WHERE Id > 8 ORDER BY Id ASC LIMIT 1) - > UNION - > (select *from previousAndNextRecordDemo WHERE Id < 8 ORDER BY Id DESC LIMIT 1);
输出如下
+----+-------+ | Id | Name | +----+-------+ | 9 | Mike | | 7 | Ramit | +----+-------+ 2 rows in set (0.03 sec)
更新于： 30-Jul-2019
6K+ 浏览
广告