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partition by range(stat_date)
(
  partition P_10_01_1 values less than date '2010-01-11' ,
  partition P_10_01_2 values less than date '2010-01-21' ,
  partition P_10_01_3 values less than date '2010-02-01' ,
  partition P_10_02_1 values less than date '2010-02-11' ,
  partition P_10_02_2 values less than date '2010-02-21' ,
  partition P_10_02_3 values less than date '2010-03-01' ,
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