Use Temporary Table to Fill Original Table With Unique Rows

 You can use a temporary table to copy over unique values from the original table, and add them back to the original table. This can be useful when a primary key does not exist.

# Step 1: Copy distinct values to temporary table
CREATE TEMPORARY TABLE tmp_user (
    SELECT id, name 
    FROM user
    GROUP BY name
);

# Step 2: Remove all rows from original table
DELETE FROM user;

# Step 3: Remove all rows from original table
INSERT INTO user (SELECT * FROM tmp_user);

# Step 4: Remove temporary table
DROP TABLE tmp_user;