select to_char(sysdate,'mm'), to_char(sysdate,'hh24') from dual;1. select * from qua_data where to_char(sysdate,'yyyymm') = '200601'2. select * from qua_data where to_char(sysdate,'yyyymmdd') = '20060116'3. select * from qua_data where to_char(sysdate,'yyyymmddhh24') = '2006011604'
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