sql - Working out top 5 places of residence from a normalised live/work relationship table

Question

I have a three column table and the column headers are: place of work, place of residence and number of commuters (geocode, geocode, number). For each place of work, I would like to know the top 5 most common places of residence along with the number of commuters. Any ideas on how to do this in SQL?

Answer 1

不确定您使用的是哪个 RDBMS，但这应该适用于 SQL Server：

with MyCTE AS
(
    select *, RANK() OVER (PARTITION BY placeOfWork ORDER BY NumberOfCommuters DESC) AS Rank
    from PlacesOfWorkWork
)
select * from MyCTE where Rank <= 5