Quick Answer: How can I remove duplicate records from a table in SQL?

How do you remove duplicate records in SQL?

HAVING COUNT(*) > 1;

  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 do you remove duplicates from a table?

Remove duplicate values

  1. Select the range of cells, or ensure that the active cell is in a table.
  2. On the Data tab, click Remove Duplicates (in the Data Tools group).
  3. Do one or more of the following: …
  4. Click OK, and a message will appear to indicate how many duplicate values were removed, or how many unique values remain.

How do I delete duplicate records from a table with keeping one copy in SQL Server?

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 duplicate records from the table with one copy?

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

How do you eliminate duplicate rows in SQL query without distinct?

Below are alternate solutions :

  1. Remove Duplicates Using Row_Number. WITH CTE (Col1, Col2, Col3, DuplicateCount) AS ( SELECT Col1, Col2, Col3, ROW_NUMBER() OVER(PARTITION BY Col1, Col2, Col3 ORDER BY Col1) AS DuplicateCount FROM MyTable ) SELECT * from CTE Where DuplicateCount = 1.
  2. Remove Duplicates using group By.

How do I remove duplicate rows in select query?

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 I find duplicate rows in SQL table?

How to Find Duplicate Values in SQL

  1. Using the GROUP BY clause to group all rows by the target column(s) – i.e. the column(s) you want to check for duplicate values on.
  2. Using the COUNT function in the HAVING clause to check if any of the groups have more than 1 entry; those would be the duplicate values.

Does group by remove duplicates?

5 Answers. GROUP BY does not “remove duplicates”. GROUP BY allows for aggregation. If all you want is to combine duplicated rows, use SELECT DISTINCT.

How do I delete duplicate rows but keep one?

Tip: You also can remove all duplicates but keep one with Select Duplicate & Unique Cells like this: Select all the unique values including the first duplicates, and then copy them by pressing Ctrl + C and paste to another location by Ctrl + V.

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Which command is used to suppress the duplicate records?

The uniq command is used to remove duplicate lines from a text file in Linux. By default, this command discards all but the first of adjacent repeated lines, so that no output lines are repeated. Optionally, it can instead only print duplicate lines.