Find largest table in a SQL Server database Monitoring table size over time is very important to the SQL Server Engine. In performance point of view to run queries. At the most optimal and avoid performance issues due to larger table size as it important factor in SQL Server performance There are often many times people ask, how to find the largest tables/objects in a database, so below scripts, will determine which objects in a database are largest. SELECT t.name AS TableName, i.name as indexName, sum(p.rows) as RowCounts, sum(a.total_pages) as TotalPages, sum(a.used_pages) as UsedPages, sum(a.data_pages) as DataPages, (sum(a.total_pages) * 8) / 1024 as TotalSpaceMB, (sum(a.used_pages) * 8) / 1024 as UsedSpaceMB, (sum(a.data_pages) * 8) / 1024 as DataSpaceMB 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 WHERE t.name NOT LIKE 'dt%' AND i.object_id > 255 AND i.index_id <= 1 GROUP BY t.name, i.object_id, i.index_id, i.name ORDER BY TotalSpaceMB DESC

Grouping by two columns where the value in column A and B are the same

Vikash

Suppose that I have this sql table

Table: Chat

+---------+----------+----------+
| ToUser  | FromUser | Message  |
+---------+----------+----------+
| 1       |       10 | hi       |
| 8       |        1 | yes      |
| 2       |        8 | blah     |
| 10      |        1 | test     |
| 1       |       10 | anything |
| 9       |        4 | hello    |
| 2       |        3 | hi       |
+---------+----------+----------+

How can I group by ToUser and FromUser where it considers the rows where ToUser = 1 and FromUser = 10 are in the same group of the rows ToUser = 10 and FromUser = 1

I tried the following:

select ToUser, FromUser
from Chat
group by ToUser, FromUser

but this did not help, it considers them different groups.

How can I solve this issue?