How to query duplicated data in SQL?

1 year ago

Benjamin Taylor

1 minute

To find duplicate data, you can use the GROUP BY and HAVING clauses.

Here is an example query, assuming there is a table named “table_name” with a column named “column_name”.

SELECT column_name, COUNT(column_name) as count
FROM table_name
GROUP BY column_name
HAVING COUNT(column_name) > 1

This query will return all rows that have duplicate values in the “column_name” column, along with the number of times the duplicate values occur.