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S:SELECT log10(10) value 1
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S:SELECT SQUARE(4) value 16
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S:SELECT SQRT(4) value 2
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S:SELECT power(3,4) value 81
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S:SELECT sign(-8) value -1
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S:SELECT PI() value 3.1415926535897931
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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'
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