SELECT number of Logical CPU - sql-server

Question

I have written query that allows me to have an overview of all Azure SQL Database inside an Azure SQL Server; this query needs to be run on master:
DECLARE #StartDate date = DATEADD(day, -30, GETDATE()) -- 14 Days
SELECT
database_name AS DatabaseName,
sysso.edition
,sysso.service_objective
,(SELECT TOP 1 storage_in_megabytes FROM sys.resource_stats AS rs2 WHERE rs2.database_name = rs1.database_name ORDER BY rs2.start_time DESC) AS StorageMB
,CAST(MAX(storage_in_megabytes) / 1024 AS DECIMAL(10, 2)) StorageGB
,MIN(end_time) AS StartTime
,MAX(end_time) AS EndTime
,CAST(AVG(avg_cpu_percent) AS decimal(4,2)) AS Avg_CPU
,MAX(avg_cpu_percent) AS Max_CPU
,(COUNT(database_name) - SUM(CASE WHEN avg_cpu_percent >= 40 THEN 1 ELSE 0 END) * 1.0) / COUNT(database_name) * 100 AS [CPU Fit %]
,CAST(AVG(avg_data_io_percent) AS decimal(4,2)) AS Avg_IO
,MAX(avg_data_io_percent) AS Max_IO
,(COUNT(database_name) - SUM(CASE WHEN avg_data_io_percent >= 40 THEN 1 ELSE 0 END) * 1.0) / COUNT(database_name) * 100 AS [Data IO Fit %]
,CAST(AVG(avg_log_write_percent) AS decimal(4,2)) AS Avg_LogWrite
,MAX(avg_log_write_percent) AS Max_LogWrite
,(COUNT(database_name) - SUM(CASE WHEN avg_log_write_percent >= 40 THEN 1 ELSE 0 END) * 1.0) / COUNT(database_name) * 100 AS [Log Write Fit %]
FROM sys.resource_stats AS rs1
inner join sys.databases dbs on rs1.database_name = dbs.name
INNER JOIN sys.database_service_objectives sysso on sysso.database_id = dbs.database_id
WHERE start_time > #StartDate
GROUP BY database_name, sysso.edition, sysso.service_objective
ORDER BY database_name , sysso.edition, sysso.service_objective
Here the output:
I would like to add to this query how many logical CPU each database has.
I know that there is query that I can run on each database but I want to SELECT how many logical CPU each database has by querying the master database.
Is there a way to grab such information form the sys. tables?
Or dynamic SQL is the only way to go?
EDIT:
#Charlieface suggested to use SELECT cpu_count FROM sys.dm_os_sys_info which is right but if I run it on master I only see the CPU used on master. I need to retrieve the CPUs used for each database.

Answer 1

You add the following subquery:
(SELECT cpu_count FROM sys.dm_os_sys_info)
See the documentation.
Further information for each processor can be got from sys.dm_os_nodes
It seems Azure Managed Instance only returns data for master. So you need to insert it into a temp table or table variable and join on that.
DECLARE #sql nvarchar(max);
SELECT #sql = STRING_AGG(CAST('
SELECT ' + d.id + ', cpu_count FROM ' + QUOTENAME(d.name) + '.sys.dm_os_sys_info
' AS nvarchar(max)), '
UNION ALL
' )
FROM sys.databases;
PRINT #sql; --your friend
DECLARE #tmp TABLE (db_id int PRIMARY KEY, cpu_count int NOT NULL);
INSERT #tmp (db_id, cpu_count)
EXEC sp_executesql #sql;
SELECT ....
cpu.cpu_count
FROM ...
LEFT JOIN #tmp cpu ON cpu.db_id = dbs.id;