SQL get size of all tables in database

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SELECT

    t.NAME AS TableName,

    s.Name AS SchemaName,

    p.rows AS RowCounts,

    SUM(a.total_pages) * 8 AS TotalSpaceKB,

    SUM(a.used_pages) * 8 AS UsedSpaceKB,

    (SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceKB

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

    UsedSpaceKB DESC

---

EXEC  sp_spaceused N'tableName'

----------------

SET NOCOUNT ON

DBCC UPDATEUSAGE(0)

-- Table row counts and sizes.

DECLARE @sizes TABLE

(

    [name] NVARCHAR(128),

    [rows] CHAR(11),

    reserved VARCHAR(18),

    data VARCHAR(18),

    index_size VARCHAR(18),

    unused VARCHAR(18)

)

INSERT @sizes EXEC sp_msForEachTable 'EXEC sp_spaceused ''?'''

SELECT *

FROM   @sizes

ORDER BY convert(int, substring(data, 1, len(data)-3)) desc

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