SQL
Identify Duplicate Rows Based on Columns
Discover how to find and list duplicate rows in your SQL tables based on one or more specified columns, useful for data cleaning and integrity checks.
SELECT column1, column2, COUNT(*) FROM your_table GROUP BY column1, column2 HAVING COUNT(*) > 1;
How it works: This query identifies rows where the combination of `column1` and `column2` appears more than once. It groups by the specified columns and then filters these groups using `HAVING` to show only those with a count greater than one, indicating duplicates.