How to use Subquery In MariaDB
We’ll assume that the table has been restored to its original state (with the duplicates).
DELETE FROM States
WHERE (state_name, capital, id) NOT IN (
SELECT state_name, capital, MIN(id)
FROM States
GROUP BY state_name, capital
);
Output:
Duplicates Removed
Explanation: This query deletes rows from the States table where the combination of state_name and capital is not associated with the minimum id value for each combination. This effectively retains only one instance of each unique combination and removes duplicates. Now there are no duplicates in our States table.
How to Delete Duplicate Rows in MariaDB
Duplicate rows in a database can lead to data inconsistencies and inefficiencies. In MariaDB, we can remove duplicate rows using various methods to ensure data integrity and optimize database performance.
In this article, We will explore different techniques to identify and delete duplicate rows in MariaDB with the help of examples and so on.
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