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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 12:35:57
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