Oracle的sql语句中关键字冲突用双引号

select distinc user from instrument where created>"TO_DATE"('2015-02-05 12:00:00', 'yyyy-mm-dd hh24:mi:ss')

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select distinc “user” from instrument where created>"TO_DATE"('2015-02-05 12:00:00', 'yyyy-mm-dd hh24:mi:ss')