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

0 vote162 views2 answers
Postgresql could not start server mac
SQL
0 vote312 views1 answer
Delet all record statment sql
SQL
0 vote206 views1 answer
Mysql filter based on datediff
SQL
1 vote330 views1 answer
Primary key reset in SQL database
SQL
0 vote202 views1 answer
Mariadb errno 121
SQL
0 vote195 views1 answer
Oracle current timestamp
SQL
11 votes214 views4 answers
Update row in mysql
SQL
0 vote228 views1 answer
Sql select min row
SQL
-1 vote190 views3 answers
Mysql get age from date
SQL
3 votes289 views2 answers
How to list columns for particular tables in postgresql
SQL