SELECT top 1000 [Timestmp]
 ,[Audience]
 ,[Severity]
,[Verbosity]
,[UserFullName]
FROM [PD_SQL_DB].[dbo].[Client1_DiagList]
wHERE [aUDIENCE]='8' AND [SEVERITY] = '4'AND [VERBOSITY] = '0'
Union
SELECT top 1000 [TimeStmp]
,[MessageText]
,[Audience]
,[Severity]
,[Verbosity]
,[UserFullName]
FROM [PD_S`enter code here`QL_DB].[dbo].[Client2_DiagList]
WHERE [AUDIENCE]='8' AND [SEVERITY] = '4'AND [VERBOSITY] = '0'
 Order by [TimeStmp] desc