Find user defined system tables

A few things are "hard coded" in SSMS to separate user and system objects; "dbo.sysdiagrams" is such a case.

Run SQL Server Profiler and refresh the view in SSMS, then you get the query to select all "system tables", looks like this:

exec sp_executesql N'SELECT
tbl.name AS [Name],
SCHEMA_NAME(tbl.schema_id) AS [Schema],
''Server[@Name='' + quotename(CAST(
        serverproperty(N''Servername'')
       AS sysname),'''''''') + '']'' + ''/Database[@Name='' + quotename(db_name(),'''''''') + '']'' + ''/Table[@Name='' + quotename(tbl.name,'''''''') + '' and @Schema='' + quotename(SCHEMA_NAME(tbl.schema_id),'''''''') + '']'' AS [Urn],
tbl.create_date AS [CreateDate],
CAST(
 case 
    when tbl.is_ms_shipped = 1 then 1
    when (
        select 
            major_id 
        from 
            sys.extended_properties 
        where 
            major_id = tbl.object_id and 
            minor_id = 0 and 
            class = 1 and 
            name = N''microsoft_database_tools_support'') 
        is not null then 1
    else 0
end          
             AS bit) AS [IsSystemObject]
FROM
sys.tables AS tbl
WHERE
(CAST(
 case 
    when tbl.is_ms_shipped = 1 then 1
    when (
        select 
            major_id 
        from 
            sys.extended_properties 
        where 
            major_id = tbl.object_id and 
            minor_id = 0 and 
            class = 1 and 
            name = N''microsoft_database_tools_support'') 
        is not null then 1
    else 0
end          
             AS bit)=@_msparam_0)
ORDER BY
[Schema] ASC,[Name] ASC',N'@_msparam_0 nvarchar(4000)',@_msparam_0=N'1'

it filters on "extended properties" for microsoft_database_tools_support

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Olaf Helper

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