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select t.OSUSER,t.STATUS,t.LOGON_TIME from v$session t
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select t.OSUSER,t.STATUS,t.LOGON_TIME from v$session t where t.OSUSER='liuzhaoqing'
select t.OSUSER,t.STATUS,t.LOGON_TIME from v$session t where t.OSUSER='ymx'
select t.OSUSER,t.STATUS,t.LOGON_TIME from v$session t where t.OSUSER='DFL'
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