Finding Duplicate Rows Based on Specific Columns

SELECT
    column1,
    column2,
    COUNT(*) as duplicate_count
FROM
    your_table_name
GROUP BY
    column1,
    column2
HAVING
    COUNT(*) > 1;

How it works: This SQL query identifies rows that have identical values across `column1` and `column2`. It groups the data by these columns and then uses the `HAVING` clause to filter for groups where the count of rows is greater than one, indicating duplicates. This is a fundamental step in data quality management and can be extended to any number of columns.