How to remove duplicate entries from a large Oracle table (200M rows, 20 columns)? The below query from 2014 is slow. It took 2 minutes to delete 1 duplicate entry for one specific combination of columns (i.e. where col1 = 1 and .. col20 = ‘Z’). Any way to speed it up, e.g. with indexing? Answer R…
Tag: duplicates
SQL Developer duplicate column name while creating view
I am getting this error while running statement specified below ORA-00957: duplicate column name 00957. 00000 – “duplicate column name” My query: Answer Just need to add column aliases.
SQL: exclude rows that are duplicates according to some column arrangement
In my problem, I have these rows e.g.: They show pair-wise combinations of ids and names, together with another column c. I consider row 1+2, and 3+4 as duplicates, considering the pairings of ids and names. Rows 1+2, or 3+4 show basically the same information. I had no luck removing the duplicates with group…
SQL query for duplicate rows based on 2 columns
I have 3 tables movie, rating and reviewer movie has 4 columns movieID, title, year, director rating has 4 columns reviewerID, movieID, stars, ratingDate reviewer has 2 columns reviewerID, name How do I query reviewer who rated the same movie more than 1 time and gave it higher rating on the second review. Th…
How to delete rows that have duplicate column combination
I need to delete some rows that have the same column combination (except ID). The row that should be kept is the one that has the maximum reference date So, after the query the table should be like this I know that the query below will return the table I want, but I don’t know how to delete the “d…
Remove duplicate columns after using join on in sql
I have the following sql query that joins two select statements on two columns The query produces the following output. | Name | ItemNum |TicketNum |TicketNum |ItemNum | But I would like the output to be | Name | ItemNum |TicketNum | Answer Solution 1: Specify the column names like this Solution 2:
Duplicated inner join results
With postgres I’m trying to get a single user and all their posts, but when I inner join the Users and Posts tables I receive this: QUERY: I’m also trying to do the same thing but as a json QUERY: I know why but I don’t know how to avoid it, can someone help me to get something like this:
SQL for finding multiple column matches (dups)
I’m trying to write a query to find all rows that have three columns in common with other rows. Imagine a person can only send one letter to another per day and I need to identify “dups” even though all of the columns may not be the same. I want to see all rows that have the same Sender_ID A…
Laravel Row duplication inserted, with updateOrCreate method with Race-Condition
i have function in my controller that create a forecast : As you can see i use updateOrCreate methods to add or update a forecast. The problem is when 2 requests from the same user run at the same time (and no forecast is already created) 2 row are inserted. Do you have a solution ? I See that the
Trying to delete duplicate rows in SQL Server where the difference is the date or batch number
I have this query: Which is returning the following results ID_NUMBER INCEPTION_DATE OCCURRENCE TRANSACTION_DATE FILE_LOAD_DATE BATCH_NUM 112897732 2008-09-15 4 2008-07-03 2008-07-07 17:57:19 06341 112897732 2008-09-15 4 2008-07-13 2008-07-18 03:35:55 06753 828194721 2008-11-11 1 2008-09-06 2008-09-17 02:50:4…