PostgreSQL: Remove Duplicate Rows

In PostgreSQL, you can remove duplicate rows in a table using the following methods:

1. Identify rows with duplicate data.
2. Retrieve the columns col1, col2, …, coln and count the number of occurrences in the table. Group these results by the columns col1, col2, …, coln and filter to only show results where the count is greater than 1.
3. Create a temporary table to store the rows of duplicate data that need to be deleted.
4. Create a temporary table named temp_table, and select only distinct rows based on columns col1, col2, to coln from the table table_name.
5. Delete all data from the original table.
6. Remove all data from the table named “table_name”.
7. Reinsert the data from the temporary table back into the original table.
8. Copy all the rows from the temporary table and insert them into the specified table.
9. Finally, delete the temporary table.
10. Delete the temporary table.

Please note, it is highly recommended to back up your data before performing these actions to prevent accidental deletion.