Deleting duplicates rows from redshift

Question

I am trying to delete some duplicate data in my redshift table.

Below is my query:-

With duplicates
As
(Select *, ROW_NUMBER() Over (PARTITION by rec         


        

Answer 1

Simple answer to this question:

1. Firstly create a temporary table from the main table where value of row_number=1.
2. Secondly delete all the rows from the main table on which we had duplicates.
3. Then insert the values of temporary table into the main table.

Queries:

1. Temporary table

   select id,date into #temp_a from (select *
from (select a.*, row_number() over(partition by id order by etl_createdon desc) as rn from table a where a.id between 59 and 75 and a.date = '2018-05-24') where rn =1)a

2. deleting all the rows from the main table.

   delete from table a where a.id between 59 and 75 and a.date = '2018-05-24'

3. inserting all values from temp table to main table

   insert into table a select * from #temp_a.