Example
SELECT ps.name AS PartitionScheme
, fg.name AS [FileGroup]
, prv.*
, LAG(prv.Value) OVER (PARTITION BY ps.name ORDER BY ps.name, boundary_id) AS PreviousBoundaryValue
FROM sys.partition_schemes ps
INNER JOIN sys.destination_data_spaces dds
ON dds.partition_scheme_id = ps.data_space_id
INNER JOIN sys.filegroups fg
ON dds.data_space_id = fg.data_space_id
INNER JOIN sys.partition_functions f
ON f.function_id = ps.function_id
INNER JOIN sys.partition_range_values prv
ON f.function_id = prv.function_id
AND dds.destination_id = prv.boundary_id
