Get the size of the tables in SQL

With the next query you can get the size of all the tables in a database.

  
--
-- This query will return the information of the tables
--

SELECT 
    t.NAME AS table_name,
    s.Name AS [schema_name],
    p.rows AS row_count,
    SUM(a.total_pages) * 8 AS space_KB, 
    SUM(a.used_pages) * 8 AS used_space_KB, 
    (SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS unused_space_KB
FROM 
    sys.tables t
    INNER JOIN      
    sys.indexes i ON t.OBJECT_ID = i.object_id
    INNER JOIN 
    sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id
    INNER JOIN 
    sys.allocation_units a ON p.partition_id = a.container_id
    LEFT OUTER JOIN 
    sys.schemas s ON t.schema_id = s.schema_id
WHERE 
    t.NAME NOT LIKE 'dt%' AND 
 t.is_ms_shipped = 0   AND 
 i.OBJECT_ID > 255 
GROUP BY 
    t.Name, s.Name, p.Rows
ORDER BY 
    t.table_name DESC