How to remove duplicate in sql

Query delete duplicates

DELETE FROM dups a USING (
      SELECT MIN(ctid) as ctid, key
        FROM dups 
        GROUP BY key HAVING COUNT(*) > 1
      ) b
      WHERE a.key = b.key 
      AND a.ctid <> b.ctid

Sql delete duplicate

-- Oracle
DELETE films
WHERE rowid NOT IN (
    SELECT min(rowid)
    FROM films
    GROUP BY title, uk_release_date
);

How to remove duplicate in sql

Distinct: helps to remove all the duplicate
records when retrieving the records from a table.

SELECT DISTINCT FIRST_NAME FROM VISITORS;

Sql delete duplicate rows but keep one

# 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;

Source: designcise.com

Similar codes

1 vote187 views2 answers
Maximum number of tables in mysql
SQL
0 vote186 views2 answers
How to create a table from another table in sql derby
SQL
0 vote170 views1 answer
Postgresql find missing id
SQL
1 vote187 views1 answer
Convert varchar to int in sqlite
SQL
0 vote177 views1 answer
Psql initialization
SQL
1 vote199 views1 answer
Load mysql dumb
SQL
0 vote172 views1 answer
Mysql calculated column
SQL
6 votes171 views5 answers
Alter table oracle
SQL
0 vote179 views1 answer
Heavy table in mysql
SQL
0 vote193 views1 answer
Power bi union columns
SQL