May 8, 2013 · Therefore, you could use DELETE FROM some_table WHERE x="y" AND foo="bar" LIMIT 1; note that there isn't a simple way to say "delete everything except one" - just keep checking whether you still have row duplicates.

Sep 9, 2015 · DELETE FROM code_sum_country WHERE code in (SELECT code FROM code_sum_country GROUP BY code HAVING COUNT (code) > 1) AND country NOT IN (SELECT MIN(country) FROM code_sum_country GROUP BY code HAVING COUNT (code) > 1)

Oct 22, 2015 · One way to do this is to look up the previous row for each item and check if that row has the same data. If so, we can delete the row: -- For each row, find the previous row for this item. SELECT TOP 1 prev.id, prev.Listings, prev.UnitPrice, prev.Quantity. FROM CommerceState prev. WHERE prev.itemId = c.itemId. AND prev.[Timestamp] < c.[Timestamp]

Dec 25, 2017 · I have column "name" with the same values. For example: select * table WHERE name Like 'Kate' Result: 2 rows with this name. I need leave only one row that has this name (random) in such rows. And don't show other entries that have the same names. How can I …

Mar 26, 2022 · The following examples use T-SQL to delete duplicate rows in SQL Server while ignoring the primary key or unique identifier column. More specifically, the examples delete duplicate rows but keep one. So, given two identical rows, one is deleted and the other remains.

Dec 6, 2023 · The most common way to remove duplicate rows from our query results is to use the DISTINCT clause. The simplest way to use this is with the DISTINCT keyword at the start of the SELECT list. Suppose we have a table like this:

Apr 14, 2025 · In this article, we will explain the process of deleting duplicate rows from a SQL table step-by-step, using SQL Server, with examples and outputs. We’ll cover techniques using GROUP BY, CTE, and more, incorporating best practices to help us effectively handle duplicates. What Are Duplicate Rows?

Oct 19, 2021 · In this article, we will see, how to delete certain rows based on comparisons with other tables. We can perform the function by using a subquery in place of the condition in WHERE Clause. A subquery is a query that appears inside another query. It …

Jun 26, 2023 · An alternate is use ROW_NUMBER() function to assign row number 1 (one) to the row that you need and then eliminate the others with rownumber > 1.

Oct 20, 2020 · So to delete the duplicate record with SQL Server we can use the SET ROWCOUNT command to limit the number of rows affected by a query. By setting it to 1 we can just delete one of these rows in the table. Note: the select commands are just used to show the data prior and after the delete occurs. SET ROWCOUNT 1 .