为了理解这个概念,我们使用表‘Details_city’中的数据,如下 -Mysql> Select * from details_city; +--------+--------+ | City1 | City2 |
为了理解这个概念,我们使用表‘Details_city’中的数据,如下 -
Mysql> Select * from details_city;
+--------+--------+
| City1 | City2 |
+--------+--------+
| Delhi | Nagpur |
| Delhi | Mumbai |
| Nagpur | Delhi |
| Katak | Delhi |
| Delhi | Katak |
+--------+--------+
5 rows in set (0.00 sec)
现在,以下查询将从details_city表中删除反向重复值 -
mysql> Select a.city1,a.city2 from details_city a WHERE a.city1 <= a.city2;
+-------+--------+
| city1 | city2 |
+-------+--------+
| Delhi | Nagpur |
| Delhi | Mumbai |
| Delhi | Katak |
+-------+--------+
3 rows in set (0.06 sec)
--结束END--
本文标题: 如何从MySQL表中删除以相反顺序存储的重复值?
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