logo
down
shadow

Display all duplicate records based multiple columns


Display all duplicate records based multiple columns

Content Index :

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


Comments
No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

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,
             var2,
             var3,
             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,
             var2,
             var3,
             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
    end
  end

end

Model.dedupe

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)
SELECT O.EMP_ID 
FROM ORDERS O 
GROUP BY O.EMP_ID  
HAVING COUNT(distinct O.ITEM_ID) <> COUNT(*)

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:
Product.where.not(
  id: Product.group(:legacy_id, :company).pluck('min(products.id)')
).delete_all
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,
       address,
       city
FROM   (SELECT *,
               COUNT(*) OVER (PARTITION BY fullname, city) AS cnt
        FROM   employee) e
WHERE  cnt > 1 
Related Posts Related QUESTIONS :
  • How do I change the auto increment counter in MySQL from +1 to +43
  • How to query non duplicate rows but keep the primary key
  • How to group all scores by username in a table and display rank?
  • How to remove timestamp with the date using sql query?
  • Modify SQL query to get data only from past 2 months
  • change engine type from MyISAM to InnoDB
  • Need mysql query to find total sum as per matched query
  • json_table syntax and structure
  • Is there any way in sql query to rank certain value in ordered set of records such that ranking reset after it encounter
  • not able to login in google cloud storage sql instance
  • Inserting data into MySQL database with VBA
  • Make (user_id&music_id) unique in Likes table and Dislikes table
  • Can't do 50k insertion using bulkCreate
  • SQL syntax to get data IN date
  • How to get 4-byte emojis to store correctly in mysql 5.7?
  • How to create an in-memory database for PHPUnit testing?
  • How to write an SQL query to fetch the id in a column that has all the required data in some other column?
  • Invalid COLUMN in the select list because it is not contained in either an aggregate function or the GROUP BY clause
  • How to get actual index number of rows in MySQL when using Where clause
  • SQL Table Relationship
  • How to fix "FUNCTION doesnt exist" error in mysql?
  • Importing .bak from MSSQL into MySQL database
  • Aggregate query with distinct subquery kills every connection
  • How do i use and with multiple or condition?
  • How to fix 'The server requested authentication method unknown to the client [caching_sha2_password]' on docker compose?
  • In Mysql How to fetch distinct row value from a column1 and sum(column 2 row value) group by invoice number
  • MySQL ORDER BY field with a toggle
  • How to insert system's Date into Table
  • Aws lambda function too many connection issue rds
  • MYSQL - join 2 tables - sort in time
  • SQL code to select records where field_A matches the field_A value of a certain field_B value
  • How to model Amazon Redshift external table for changing column structure?
  • Query the list of CITY names from STATION that do not start with vowels and do not end with vowels. Your result cannot c
  • how to get rows with time for each minute for last 30 minutes
  • SQL Query With Between ,AND & OR in Where Clauses Not Given Correct Answers
  • ER_PARSE_ERROR: You have an error in your SQL syntax;
  • How to write normal sql queries inside controller in laravel
  • MySql query between range values(single record)
  • Set length conditions on text column in MySQL table
  • Mysql order of sorting
  • Sequelize raw queries TextRow and getting data out of it
  • Comparing the contents of two csv files, where the relation between the two files is specified in a third file?
  • Can 1 primary id link to multiple ids in one table?
  • Rewrite MySQL query and make it short
  • Why are parentheses used in JOIN USING clauses
  • Delete from row to row in phpadmin
  • Inserting Data into a table
  • How to efficiently get a entry with highest version in mysql table
  • How do I create views in dolphindb?
  • MySQL - update with inner join is creating nulls
  • Should i rather use a subquery or a combined WHERE?
  • INSERT INTO using data from other table causing ERROR 1064
  • How to display a MySQL table completely?
  • Can create procedure without using delimiter in MySQL?
  • distributed crawler and consistency
  • How to use mysql in node with Typescript
  • Is there any collation to differentiate 'е' and 'ё' in case insensitive way?
  • How to grant all privileges to specific user to remote ip
  • MySQL - Why is Safe Update Mode blocking this UPDATE command?
  • Can someone tell me why this query isn't working please?
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com