Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to delete the duplicate values stored in reverse order from MySQL table?
To understand this concept, we are using the data from table ‘Details_city’ as follows −
mysql> Select * from details_city; +--------+--------+ | City1 | City2 | +--------+--------+ | Delhi | Nagpur | | Delhi | Mumbai | | Nagpur | Delhi | | Katak | Delhi | | Delhi | Katak | +--------+--------+ 5 rows in set (0.00 sec)
Now, the following query will delete the reverse duplicate values from details_city table −
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)
Updated on: 22-Jun-2020
235 Views
Advertisements