Seeder question: I have a table whose clustered index is created on a partition scheme - how do I determine what file group each partition is stored in using a query? It needs to be a query rather than referencing the DDL because the information is needed for a space report.
This turned out to be tougher than I thought it would. I had to do some serious BOL research to figure out the connection (sys.allocation_units). I decided to include the approximate number of rows from sys.partitions as some extra information.
DECLARE @TableName sysname = 'MyTable';
SELECT p.partition_number, fg.name, p.rows
FROM sys.partitions p
INNER JOIN sys.allocation_units au
ON au.container_id = p.hobt_id
INNER JOIN sys.filegroups fg
ON fg.data_space_id = au.data_space_id
WHERE p.object_id = OBJECT_ID(@TableName)
