Use the COUNT() function to find the duplicate rows from a table. How to Find Duplicate Rows in PostgreSQL? However, counting the duplication of rows in large tables is challenging. Since the programming_languages table has limited records, so we can calculate the duplicates easily. The output shows that the programming_languages table contains some duplicated records. Let’s run the SELECT command to see the newly inserted data from the programming_languages table: SELECT * FROM programming_languages Let’s insert some data into it: INSERT INTO programming_languages(id, language) The programming_languages table has been created successfully. Let’s create a table named programming_languages and insert some duplicate rows in it: CREATE TABLE programming_languages( To illustrate this concept more clearly, let's create a sample table. How to Delete Duplicates Using Immediate Tables in Postgres?.How to Delete Duplicates Using Subquery?.How to Delete Duplicates in Postgres Using a DELETE USING Statement?.How to Find Duplicate Rows in PostgreSQL?.This post discusses the below-listed methods to find and delete duplicate rows in PostgreSQL: PostgreSQL provides multiple ways to find and delete duplicate rows in PostgreSQL. However, if the table has enormous data, then finding and deleting the duplicates can be challenging. Finding and deleting duplicate rows is pretty easy if the table has a limited number of records. Deleting duplicate rows from a table is a little bit tricky.
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