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
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 server delete records that have a single duplicate column
WITH cte AS ( SELECT contact_id, first_name, last_name, email, ROW_NUMBER() OVER ( PARTITION BY first_name, last_name, email ORDER BY first_name, last_name, email ) row_num FROM sales.contacts ) DELETE FROM cte WHERE row_num > 1;
how to query without duplicate rows in sql
SELECT DISTINCT col1,col2... FROM table_name where Condition;
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;
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