SQL

Identify Duplicate Records in a Table

Learn how to find and list duplicate entries in your SQL database based on one or more columns, a common task for data cleaning and ensuring data integrity.

SELECT
  column1, column2, COUNT(*)
FROM
  your_table
GROUP BY
  column1, column2
HAVING
  COUNT(*) > 1;

How it works: This snippet is used to locate duplicate records within a table based on the combination of `column1` and `column2`. It groups rows by these columns and then uses `HAVING COUNT(*) > 1` to filter for groups where more than one row shares the same values, indicating duplicates.

Identify Duplicate Records in a Table

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