#Solution-1: SQL Query

The query joins information from the system catalog views such as “sys.tables”, “sys.indexes”, ”sys.partitions”, and “sys.allocation_units” to calculate the size of each table in KB(kilobytes) and as well as MB(megabytes).

It provides a detailed overview of all tables in the specified database, including the table name row count, total size, used size, and unused side. The results are ordered by total size in descending order, so you can easily identify the largest tables.

SELECT 
    t.name AS TableName,
    s.name AS SchemaName,
    p.rows,
    SUM(a.total_pages) * 8 AS TotalSpaceInKB, 
    CAST(ROUND(((SUM(a.total_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS TotalSpaceInMB,
    SUM(a.used_pages) * 8 AS UsedSpaceKB, 
    CAST(ROUND(((SUM(a.used_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS UsedSpaceInMB, 
    (SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceInKB,
    CAST(ROUND(((SUM(a.total_pages) - SUM(a.used_pages)) * 8) / 1024.00, 2) AS NUMERIC(36, 2)) AS UnusedSpaceInMB
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 
    TotalSpaceInMB DESC, t.name;

Results:

#Solution-2:CTE Query

with CTE as (  
  SELECT  
  t.name as TableName,  
  SUM (s.used_page_count) as used_pages_count,  
  SUM (CASE  
              WHEN (i.index_id < 2) THEN (in_row_data_page_count + lob_used_page_count + row_overflow_used_page_count)  
              ELSE lob_used_page_count + row_overflow_used_page_count  
          END) as pages  
  FROM sys.dm_db_partition_stats  AS s   
  JOIN sys.tables AS t ON s.object_id = t.object_id  
  JOIN sys.indexes AS i ON i.[object_id] = t.[object_id] AND s.index_id = i.index_id  
  GROUP BY t.name  
  )  
  ,cte2 as(select  
      cte.TableName,   
      (cte.pages * 8.) as TableSizeInKB,   
      ((CASE WHEN cte.used_pages_count > cte.pages   
                  THEN cte.used_pages_count - cte.pages  
                  ELSE 0   
            END) * 8.) as IndexSizeInKB  
  from CTE  
 )  
 select TableName,TableSizeInKB,IndexSizeInKB,  
 case when (TableSizeInKB+IndexSizeInKB)>1024*1024   
 then cast((TableSizeInKB+IndexSizeInKB)/1024*1024 as varchar)+'GB'  
 when (TableSizeInKB+IndexSizeInKB)>1024   
 then cast((TableSizeInKB+IndexSizeInKB)/1024 as varchar)+'MB'  
 else cast((TableSizeInKB+IndexSizeInKB) as varchar)+'KB' end [TableSizeIn+IndexSizeIn]  
 from CTE2  
 order by 2 desc

Result:

#Solution-3:T-SQL |Stored Procedure

-- Using T-SQL
DECLARE @table_name sysname 
DECLARE table_list_cursor 
CURSOR FOR SELECT TABLE_NAME from INFORMATION_SCHEMA.TABLES 
where TABLE_TYPE='BASE TABLE' 
IF EXISTS ( SELECT * FROM    tempdb.INFORMATION_SCHEMA.COLUMNS WHERE    table_name = '##TABLE_RES')
BEGIN    
DROP TABLE ##TABLE_RES END CREATE TABLE ##TABLE_RES( Name nvarchar(255), 
Rows int, reserved varchar(18), Data varchar(18), index_size varchar(18),
Unused varchar(18)) OPEN table_list_cursor 
FETCH NEXT FROM table_list_cursor INTO @table_name 
INSERT INTO ##TABLE_RES exec sp_spaceused @table_name
WHILE @@FETCH_STATUS = 0 
BEGIN    FETCH NEXT FROM table_list_cursor INTO @table_name
INSERT INTO ##TABLE_RES exec sp_spaceused @table_name 
END CLOSE table_list_cursor 
DEALLOCATE table_list_cursor 
SELECT * from ##TABLE_RES order by rows desc

#Solution-4: To Get the size of all tables in the SQL Server Database

In SQL Server, it is an easier way to get the size of all tables in the database is to use the Standard Report feature available in SQL Server Management Studio.

• Open the SSMS (SQL Server Management Studio)
• Now, Right Click on the Selected Database.
• Select Reports
• Next, Select Standard Reports
• Then Click on Disk Usage by Table

Output:

See Also:

• Replace Null with Empty String in SQL Using Coalesce | ISNULL function
• What are the benefits of using MS SQL Server?
• How to Reset Identity Columns in SQL Server
• Top 15 SQL Server Management Studio Keyboard Shortcuts and Tips
• How to Calculate Date & Time in SQL Server

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