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法律學如何在 MySQL 中使用單個查詢找出前一條和後一條記錄？
可以使用 UNION 在 MySQL 中獲取前一條和後一條記錄。
語法如下
(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);
為了理解這個概念，我們先來建立一個表。建立表的查詢如下
mysql> create table previousAndNextRecordDemo - > ( - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > Name varchar(30) - > ); Query OK, 0 rows affected (1.04 sec)
為該表插入一些記錄，使用 insert 指令。
查詢如下
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 語句來顯示錶中的所有記錄。
查詢如下
mysql> select *from previousAndNextRecordDemo;
輸出如下
+----+---------+ | 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)
以下查詢使用 UNION 單個查詢獲取前一條和後一條記錄
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);
輸出如下
+----+-------+ | Id | Name | +----+-------+ | 9 | Mike | | 7 | Ramit | +----+-------+ 2 rows in set (0.03 sec)
更新於： 30-Jul-2019
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