How can I delete duplicate records?

How can I delete duplicate records?

Remove duplicate values

1. Select the range of cells that has duplicate values you want to remove. Tip: Remove any outlines or subtotals from your data before trying to remove duplicates.
2. Click Data > Remove Duplicates, and then Under Columns, check or uncheck the columns where you want to remove the duplicates.
3. Click OK.

How do you remove duplicates from an array in Ruby?

How to Use The Ruby Uniq Method To Remove Duplicates

1. If you have an array like this one: n = [1,1,1,2,3,4,5]
2. Example: n.uniq # [1,2,3,4,5]
3. Example: unique_numbers = n.uniq.
4. Now:
5. Here’s an example: fruits = \%w(orange apple banana)
6. If we use uniq like this: fruits.uniq(&:size) # [“orange”, “apple”]

How do you delete duplicate records in the same table?

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

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

How do I remove duplicates but keep rows?

Remove duplicates but keep rest of row values with Filter

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.

How do you find duplicates in access?

How to Find Duplicate Records in Access

1. Launch the Query Wizard. Click Query Wizard from the Create tab in the Ribbon.
2. Select the Duplicates Option.
3. Select the Table or Query.
4. Select the Field/s with Potential Duplicates.
5. Select the extra Field/s to Display.
6. Name the Query.
7. The Results.

What is Uniq in Ruby?

Ruby | Array uniq() function Array#uniq() : uniq() is a Array class method which returns a new array by removing duplicate values in the array. Syntax: Array.uniq() Parameter: Array. Return: a new array by removing duplicate values in the array.

How do you delete an element from an array in Ruby?

Ruby- Remove Elements From An Array

1. ​To remove the first element of an array,we need to use Array.
2. To remove the last element of an array,we can use the Array.pop or Array.pop() command.
3. If you want to remove an element of an array at an index, use Array.delete_at(index) command.

How can you delete duplicate records in a table with no 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.