Identify Duplicate Rows
Identify the duplicate rows in our table by executing the below steps:
Using GROUP BY and HAVING Clause: Construct a query grouping by the columns which define uniqueness and filter using the HAVING clause to identify rows having a count greater than one.
SELECT state_name, capital, COUNT(*) FROM States GROUP BY state_name, capital HAVING COUNT(*) > 1;
This query will group the records by state_name and capital, and then it will count the number of occurrences for each group. Finally, it will only return the groups where the count is greater than 1, indicating duplicate entries based on the combination of state_name and capital.
Output:
Duplicate rows
Explanation: As we can see that there are two duplicate rows in our 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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