Want to know the No. of rows,space used,space reserved in each table against all the databases on server level
I believe one I use provides everything you need?

--Table space
SELECT 
    t.NAME AS TableName,
    p.rows AS RowCounts,
    SUM(a.total_pages)/128 AS TotalSpaceMB, 
    SUM(a.used_pages)/128 AS UsedSpaceMB, 
    (SUM(a.total_pages) - SUM(a.used_pages))/128 AS UnusedSpaceMB
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 &gt; 255
    AND p.[rows] &gt; 500000
GROUP BY 
    t.Name, p.Rows
ORDER BY 
    t.Name


Note the conditions in the WHERE statement which may be different for you. This is one I obtained from another website I believe, so it isn't my work! I can't find the reference to which website though...

EDIT

OK, this one is better, includes non clustered index space, identifies the schema for the tables and includes decimal points:

WITH idxs AS (
    SELECT
        t.object_id as TableID,
        t.name AS TableName,
        SUM(a.used_pages)/128.0 AS 'Indexsize(MB)'
        --, i.*
    FROM 
        sys.tables t
        INNER JOIN sys.indexes AS i ON t.object_id = i.object_id
        INNER JOIN sys.partitions AS p ON p.OBJECT_ID = i.OBJECT_ID AND p.index_id = i.index_id
        INNER JOIN sys.allocation_units AS a ON a.container_id = p.partition_id
    WHERE i.[type]=2
    GROUP BY t.object_id, t.name
)
SELECT
    s.name AS SchemaName,
    t.NAME AS TableName,
    p.rows AS RowCounts,
    SUM(a.total_pages)/128.0 AS TotalSpaceMB,
    SUM(a.used_pages)/128.0 AS UsedSpaceMB, 
    (SUM(a.total_pages) - SUM(a.used_pages))/128.0 AS UnusedSpaceMB,
    idxs.[Indexsize(MB)]
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
LEFT OUTER JOIN
    idxs ON t.object_id = idxs.TableID
WHERE 
    t.NAME NOT LIKE 'dt%' 
    AND t.is_ms_shipped = 0
    AND i.OBJECT_ID &gt; 255
    --AND p.[rows] &gt; 500000
GROUP BY 
    s.name, t.Name, p.Rows, idxs.[Indexsize(MB)]
ORDER BY 
    t.Name