oracle日期的转换

QL> create table test000(createtime date);

Table created

SQL> insert into test000 values(sysdate);

1 row inserted

SQL> commit;

Commit complete

SQL> select * from test000;

CREATETIME
-----------
12/15/2006

SQL> select * from test000 where to_date(createtime)>=sysdate-7;

CREATETIME
-----------
12/15/2006


select * from clinic_reg_master where to_date(clinic_date)>=sysdate - '7'


select * from clinic_reg_master where to_char(clinic_date)>=sysdate-7 and to_char(clinic_date)<=sysdate;

select * from clinic_reg_master
where trunc(clinic_date,'d') = trunc(sysdate,'d');


select * from yourtable where TIME BETWEEN TRUNC(TIME,'IW') AND TRUNC(TIME) + 7
查询时间点所在周日到下周六的：
select * from yourtable where TIME BETWEEN TRUNC(TIME,'WW') AND TRUNC(TIME) + 7
说明：
TRUNC(TIME,'IW')　　指定时间的本周一所在日期
TRUNC(TIME,'WW')    指定时间的本周一的前一天（周日）所在日期