SP_WHO3 - Running Queries (Toolbox)

SELECT
     SPID                  = er.session_id
    ,BlkBy                 = 
                                CASE WHEN lb.lead_blocker = 1 
                                 THEN -1 
                                 ELSE er.blocking_session_id 
                                END
    ,ElapsedMS             = er.total_elapsed_time
    ,CPU                   = er.cpu_time
    ,IOReads               = er.logical_reads + er.reads
    ,IOWrites              = er.writes
    ,Executions            = ec.execution_count
    ,CommandType           = er.command
    ,LastWaitType          = er.last_wait_type
    ,ObjectName            = OBJECT_SCHEMA_NAME(qt.objectid,dbid) + '.' + OBJECT_NAME(qt.objectid, qt.dbid)
    ,SQLStatement          = qt.text
    ,STATUS                = ses.STATUS
    ,[Login]               = ses.login_name
    ,Host                  = ses.host_name
    ,DBName                = DB_Name(er.database_id)
    ,StartTime             = er.start_time
    ,Protocol              = con.net_transport
    ,transaction_isolation =
                                CASE ses.transaction_isolation_level
                                    WHEN 0 THEN 'Unspecified'
                                    WHEN 1 THEN 'Read Uncommitted'
                                    WHEN 2 THEN 'Read Committed'
                                    WHEN 3 THEN 'Repeatable'
                                    WHEN 4 THEN 'Serializable'
                                    WHEN 5 THEN 'Snapshot'
                                END
    ,ConnectionWrites      = con.num_writes
    ,ConnectionReads       = con.num_reads
    ,ClientAddress         = con.client_net_address
    ,Authentication        = con.auth_scheme
    ,DatetimeSnapshot      = GETDATE()
FROM      sys.dm_exec_requests                  er
LEFT JOIN sys.dm_exec_sessions                  ses  ON ses.session_id = er.session_id
LEFT JOIN sys.dm_exec_connections               con  ON con.session_id = ses.session_id
OUTER APPLY sys.dm_exec_sql_text(er.sql_handle) qt
OUTER APPLY
(
    SELECT execution_count = MAX(cp.usecounts)
      FROM sys.dm_exec_cached_plans cp
     WHERE cp.plan_handle = er.plan_handle
)                                               ec
OUTER APPLY 
( 
    SELECT lead_blocker = 1 
      FROM master.dbo.sysprocesses sp 
     WHERE sp.spid IN 
                    (
                        SELECT blocked 
                          FROM master.dbo.sysprocesses WITH (NOLOCK) 
                         WHERE blocked != 0
                    ) 
       AND sp.blocked = 0 
       AND sp.spid = er.session_id
)                                               lb 

WHERE 
        er.sql_handle IS NOT NULL
    AND er.session_id != @@SPID
ORDER BY
    er.blocking_session_id DESC,
    er.logical_reads + er.reads DESC,
    er.session_id