Display all duplicate records based multiple columns

Display all duplicate records based multiple columns

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Display all duplicate records based multiple columns
Tag : mysql , By : Verbal
Date : November 25 2020, 07:06 PM

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Select only duplicate records based on few columns

Tag : sql , By : smbrant
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further If you want all the rows that have duplicates you can use count(*) over()
select var1, var2, var3
from (
      select var1,
             count(*) over(partition by var2, var3) as dc
      from YourTable
     ) as T
where dc > 1
var1 var2 var3
---- ---- ----
a    a    a
b    a    a
c    a    a
select var1, var2, var3
from (
      select var1,
             row_number() over(partition by var2, var3 order by var1) as rn
      from YourTable
     ) as T
where rn > 1
var1 var2 var3
---- ---- ----
b    a    a
c    a    a

Remove duplicate records based on multiple columns?

Tag : ruby-on-rails-3 , By : Sergio Rudenko
Date : March 29 2020, 07:55 AM
To fix this issue I'm using Heroku to host my Ruby on Rails application and for one reason or another, I may have some duplicate rows.
class Model

  def self.dedupe
    # find all models and group them on keys which should be common
    grouped = all.group_by{|model| [model.name,model.year,model.trim,model.make_id] }
    grouped.values.each do |duplicates|
      # the first one we want to keep right?
      first_one = duplicates.shift # or pop for last one
      # if there are any more left, they are duplicates
      # so delete all of them
      duplicates.each{|double| double.destroy} # duplicates can now be destroyed



Get the duplicate records based in 2 columns

Tag : mysql , By : NeedOptic
Date : March 29 2020, 07:55 AM
To fix this issue I have a table with below data (say, ORDERS table)

Delete duplicate records based on multiple columns

Tag : sql , By : Nulq
Date : March 29 2020, 07:55 AM
should help you out In our system we run hourly imports from an external database. Due to an error in the import scripts, there are now some duplicate records. , You can try the following approach:
  id: Product.group(:legacy_id, :company).pluck('min(products.id)')
delete from products
where id not in ( 
   select min(p.id) from products p group by p.legacy_id, p.company

Sql query to show only duplicate records based on two columns

Tag : sql , By : PepeM
Date : March 29 2020, 07:55 AM
around this issue Instead of a grouped COUNT you can use it as a windowed aggregate to access the other columns
SELECT fullname,
               COUNT(*) OVER (PARTITION BY fullname, city) AS cnt
        FROM   employee) e
WHERE  cnt > 1 
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