Deleting Duplicate Records While Retaining One

DELETE FROM your_table
WHERE id NOT IN (
    SELECT MIN(id)
    FROM your_table
    GROUP BY column1, column2 -- Specify columns that define a duplicate
);

How it works: This SQL snippet efficiently removes duplicate records from a table while preserving one unique instance. It works by first identifying the minimum `id` for each group of rows that share the same values in `column1` and `column2` (which define what makes a record a duplicate). Then, it deletes all rows whose `id` is *not* among these minimum IDs, effectively keeping only the earliest (or lowest ID) instance of each unique combination.