How do you delete duplicate records in SQL?

How do you delete duplicate records in SQL query?


  1. In the output above, we have two duplicate records with ID 1 and 3. …
  2. To remove this data, replace the first Select with the SQL delete statement as per the following query. …
  3. SQL delete duplicate Rows using Common Table Expressions (CTE) …
  4. We can remove the duplicate rows using the following CTE.

How can I delete duplicate records?

To remove duplicate values, click Data > Data Tools > Remove Duplicates. To highlight unique or duplicate values, use the Conditional Formatting command in the Style group on the Home tab.

How do you delete duplicate rows in SQL Server?

It can be done by many ways in sql server the most simplest way to do so is: Insert the distinct rows from the duplicate rows table to new temporary table. Then delete all the data from duplicate rows table then insert all data from temporary table which has no duplicates as shown below.

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How do I quickly delete duplicates?

How To Quickly Delete Duplicate Data

  1. Highlight the data that has duplicates you want to delete.
  2. Go to the Data tab in the ribbon.
  3. In the Data Tools section click Remove Duplicates.
  4. You can select or deselect the My data has headers box depending on if the first row of your data contains column headings or not.

How can I delete duplicate records in SQL using distinct?

The go to solution for removing duplicate rows from your result sets is to include the distinct keyword in your select statement. It tells the query engine to remove duplicates to produce a result set in which every row is unique. The group by clause can also be used to remove duplicates.

How do you delete duplicate records in mysql and keep one record?

One way to delete the duplicate rows but retaining the latest ones is by using MAX() function and GROUP BY clause.

How do I select duplicate records in SQL?

To select duplicate values, you need to create groups of rows with the same values and then select the groups with counts greater than one. You can achieve that by using GROUP BY and a HAVING clause.

How do you delete duplicate records in SQL using rownumber?

To delete the duplicate rows from the table in SQL Server, we follow these steps,

  1. Find duplicate rows using GROUP BY clause or ROW_NUMBER()
  2. Use DELETE statement to remove the duplicate rows.

How can I delete duplicate rows in SQL Server without primary key?

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.

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How do I remove duplicates in sheets?

Google Sheets: Remove duplicates from a spreadsheet

  1. Select a column from where you want to remove the duplicates.
  2. Click Data > Remove duplicates.
  3. You will now see a pop-up. Tick the box next to Data has header now > click Remove duplicates > click Done.
  4. You can repeat the steps for other columns as well.

How do I remove duplicates without shifting cells?

With a formula and the Filter function, you can quickly remove duplicates but keep rest.

  1. Select a blank cell next to the data range, D2 for instance, type formula =A3=A2, drag auto fill handle down to the cells you need. …
  2. Select all data range including the formula cell, and click Data > Filter to enable Filter function.