I have two tables with 2 columns. I cross join and subtract the values. I then find the row_number ordered by the subtraction and choose where row = 1. I’m finding the t2.id that has the closest val to t1.id These tables are quite large. Is the row_number function doing a lot of extra unneeded work by ordering everything after
Tag: row-number
SQL find the 2 highest score for each country
I have two tables: maps_query and map_time like below: The question is to find the 2 highest score for each country. Desired output is like below: I was trying to use row_number() over but don’t know how to complete the query. Answer This can be achieved by rank() instead of row_number(). A good reference article: https://spin.atomicobject.com/2016/03/12/select-top-n-per-group-postgresql/
Why Row_Number in a view gives a nullable column
I have a view using a CTE and I want use a row number to simulate a key for my edmx in Visual Studio When I look in properties of column I see Id bigint … NULL And my edmx exclude this view cause don’t find a column can be used to key When I execute my view ID have
Select 2 products per city with most counts in PostgreSQL
I have this dataset: I want the top 2 counts per the_city, so the expected result should be: I have tried this but it’s wrong Answer It’s greatest-n-per-group problem. You can use row_number()over() window function to to serialized city wise product list in descending order of count(*). Then select first two rows from each city. Query: Output: the_city the_product product_count
Creating a row number column based on another columns value
I have the following data: it’s a calendar that has date and year/week number there week is our internal calendar. what i want to do is sort by the most recent week number and have that be rel_week_index=1, and then the previous week be rel_week_index=2, etc. I got this to work by doing ROW_NUMBER() OVER(PARTITION BY YEAR ORDER BY YEAR
Merge two tables and chain id fields in order
I’m looking for a way to merge two tables (or more) and modify/order their numeric id. To put it simply here is what I want to do schematically : Table example 1 : Id Field 4 x 1 x 5 x 3 x 2 x Table example 2 : Id Field 1 x 3 x 5 x 2 x 4
how to filter data using qualify row_number in sql server [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 years ago. Improve this question I am trying to use QUALIFY to filter the data without seccess (in SQL SERVER) also, I do not want to create a table with
SQL Server Grouped Number Generation
I need a way in a SQL Server query to generate grouped numbers when the data switches from one specific data value to another. Based on the first two columns below and how they are ordered, how can the query generate the numbers in the third column? When the Type column changes from Prim to anything else, all the records
count number of times a value appears in a column not GROUP BY in SQL
Let us assume one has the following table (without the CountX column) : I would like to add the column ‘CountX’ with the number of different entries, per each combination of Name & City. I tried to use ROW_NUMBER() but it does not work well: I also tried to do a sub-query, using select distinct Name from table GROUP BY
Set row number for batch of N rows per category
I have table I want to create a another column in which i have to put row number. Logic : For 3 rows, it should be same and change to next value for 4th row. And Whenever the PHASE is changing, it should go to next number even if the set of 3 is not complete for the previous number.