Treating duplicates
In the previous exercise, you reviewed the concept of ROW_NUMBER(). In this exercise, you will use it in your code.
You want to select all the rows from the flight_statistics table that are duplicated. After that, you want to get all the rows without duplicates. You consider that the repeating group for this table is formed by the columns airport_code, carrier_code, and registration_date.
Cet exercice fait partie du cours
Cleaning Data in SQL Server Databases
Exercice interactif pratique
Essayez cet exercice en complétant cet exemple de code.
SELECT *,
-- Apply ROW_NUMBER()
___() ___ (
-- Write the partition
___ BY
___,
___,
___
ORDER BY
airport_code,
carrier_code,
registration_date
) row_num
FROM flight_statistics