How to efficiently delete duplicate data in MySQL database

Duplicate data can be a common problem in databases, increasing storage space usage, reducing query performance, and possibly causing data inconsistencies. In MySQL, you can use the following methods to quickly remove duplicate data.

Method 1: Use temporary table

Step 1: Create a temporary table with the same structure as the original table.

CREATE TABLE temp_table LIKE original_table;

Step 2: Insert the data in the original table into the temporary table and use the DISTINCT keyword to remove duplicate data.

INSERT INTO temp_table SELECT DISTINCT * FROM original_table;

Step 3: Rename the original table and rename the temporary table to the original table.

RENAME