How to transform vertical data into horizontal data with SQL?

Question

I have a table \"Item\" with a number of related items, like so:

ID   Rel_ID  Name  RelRank
---  ------  ----  -------
1    1       foo   1
2    1       bar          


        

Answer 1

I think you are looking for a mysql specific answer. Keep in mind that the syntax could vary across different data stores.

MySQL has a feature that makes this easy.

SELECT Rel_ID, GROUP_CONCAT(Name SEPARATOR ' ') As Names FROM Item GROUP BY Rel_ID;

that should work :-)