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理解SQL SERVER中的分割槽表2

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SELECT OBJECT_NAME(p.object_id) AS ObjectName,
      i.name                   AS IndexName,
      p.index_id               AS IndexID,
      ds.name                  AS PartitionScheme,   
      p.partition_number       AS PartitionNumber,
      fg.name                  AS FileGroupName,
      prv_left.value           
AS LowerBoundaryValue, prv_right.value AS UpperBoundaryValue, CASE pf.boundary_value_on_right WHEN 1 THEN 'RIGHT' ELSE 'LEFT' END AS Range, p.rows AS Rows FROM sys.partitions AS p JOIN sys.indexes AS i ON
i.object_id = p.object_id AND i.index_id = p.index_id JOIN sys.data_spaces AS ds ON ds.data_space_id = i.data_space_id JOIN sys.partition_schemes AS ps ON ps.data_space_id = ds.data_space_id JOIN sys.partition_functions AS pf ON pf.function_id =
ps.function_id JOIN sys.destination_data_spaces AS dds2 ON dds2.partition_scheme_id = ps.data_space_id AND dds2.destination_id = p.partition_number JOIN sys.filegroups AS fg ON fg.data_space_id = dds2.data_space_id LEFT JOIN sys.partition_range_values AS prv_left ON ps.function_id = prv_left.function_id AND prv_left.boundary_id = p.partition_number - 1 LEFT JOIN sys.partition_range_values AS prv_right ON ps.function_id = prv_right.function_id AND prv_right.boundary_id = p.partition_number WHERE OBJECTPROPERTY(p.object_id, 'ISMSShipped') = 0 UNION ALL SELECT OBJECT_NAME(p.object_id) AS ObjectName, i.name AS IndexName, p.index_id AS IndexID, NULL AS PartitionScheme, p.partition_number AS PartitionNumber, fg.name AS FileGroupName, NULL AS LowerBoundaryValue, NULL AS UpperBoundaryValue, NULL AS Boundary, p.rows AS Rows FROM sys.partitions AS p JOIN sys.indexes AS i ON i.object_id = p.object_id AND i.index_id = p.index_id JOIN sys.data_spaces AS ds ON ds.data_space_id = i.data_space_id JOIN sys.filegroups AS fg ON fg.data_space_id = i.data_space_id WHERE OBJECTPROPERTY(p.object_id, 'ISMSShipped') = 0 ORDER BY ObjectName, IndexID, PartitionNumber
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