“SQL Delete Duplicate” Kode Jawaban

SQL Delete Duplicate

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

sql hapus baris duplikat tetapi simpan satu

# 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;
Upset Unicorn

Hapus duplikat SQL

WITH CTE AS(
   SELECT [col1]
           ,[col2]
           ,[col3]
     ,
       RN = ROW_NUMBER()OVER(PARTITION BY [col1],[col2],[col3] ORDER BY [col1],[col2],[col3])
   FROM [dbo].[table1]

)
DELETE FROM CTE WHERE RN > 1
dr4ft

SQL Hapus duplikat

DELETE FROM [SampleDB].[dbo].[Employee]
    WHERE ID NOT IN
    (
        SELECT MAX(ID) AS MaxRecordID
        FROM [SampleDB].[dbo].[Employee]
        GROUP BY [FirstName], 
                 [LastName], 
                 [Country]
    );
WilsonWW

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