/SQL/Sql delete duplicate rows but keep one

Sql delete duplicate rows but keep one

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

Query to remove duplicate rows from a table

DELETE FROM Customers WHERE ROWID(SELECT MAX (rowid) FROM Customers C WHERE CustomerNumber = C.CustomerNumber);

Source: edureka.co

Similar codes

0 vote150 views1 answer
How to check database engine in mysql
SQL
0 vote129 views1 answer
Write a PL/SQL to print even numbers upto 100.
SQL
1 vote136 views1 answer
Change table to innodb mysql
SQL
0 vote126 views1 answer
How to see password mysql vestacp
SQL
2 votes89 views1 answer
Sql select min value from multiple columns
SQL
3 votes139 views5 answers
Sql select
SQL
1 vote146 views1 answer
Sql view where tables have same column name combine results
SQL
1 vote129 views3 answers
How to get date in sql
SQL
9 votes140 views5 answers
Laravel to sql
SQL
0 vote129 views1 answer
Services.AddDbContext DataSource Sqlite
SQL