Analyse C2 Auditing trace files data in SQL Server

Hi,

I enabled c2 auditing on a sql server and loaded those files in to a table for analysing last one month database activity. 

Requirement: I want to list out all the users who accessed any database in that server.

Can you please let me know what data should i analyse and also can you provide me the query for analysing data.

SELECT TOP 1000 [TextData]
      ,[BinaryData]
      ,[DatabaseID]
      ,[TransactionID]
      ,[LineNumber]
      ,[NTUserName]
      ,[NTDomainName]
      ,[HostName]
      ,[ClientProcessID]
      ,[ApplicationName]
      ,[LoginName]
      ,[SPID]
      ,[Duration]
      ,[StartTime]
      ,[EndTime]
      ,[Reads]
      ,[Writes]
      ,[CPU]
      ,[Permissions]
      ,[Severity]
      ,[EventSubClass]
      ,[ObjectID]
      ,[Success]
      ,[IndexID]
      ,[IntegerData]
      ,[ServerName]
      ,[EventClass]
      ,[ObjectType]
      ,[NestLevel]
      ,[State]
      ,[Error]
      ,[Mode]
      ,[Handle]
      ,[ObjectName]
      ,[DatabaseName]
      ,[FileName]
      ,[OwnerName]
      ,[RoleName]
      ,[TargetUserName]
      ,[DBUserName]
      ,[LoginSid]
      ,[TargetLoginName]
      ,[TargetLoginSid]
      ,[ColumnPermissions]
      ,[LinkedServerName]
      ,[ProviderName]
      ,[MethodName]
      ,[RowCounts]
      ,[RequestID]
      ,[XactSequence]
      ,[EventSequence]
      ,[BigintData1]
      ,[BigintData2]
      ,[GUID]
      ,[IntegerData2]
      ,[ObjectID2]
      ,[Type]
      ,[OwnerID]
      ,[ParentName]
      ,[IsSystem]
      ,[Offset]
      ,[SourceDatabaseID]
      ,[SqlHandle]
      ,[SessionLoginName]
      ,[PlanHandle]
      ,[GroupID]
  FROM [audit].[dbo].[audit]