oracle to_char 函数[@more@]
SQL> select * from t
2 ;
ID STARTTIME
---------- ------------
0 08-AUG-11
0 07-AUG-11
0 06-AUG-11
0 05-AUG-11
SQL> select * from t where to_char(starttime,'yyyymmdd') < 20110807;
ID STARTTIME
---------- ------------
0 06-AUG-11
0 05-AUG-11
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