bank_holidays 表结构
desc bank_holidays
Name Null Type
------------------------------ -------- ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
BANK_HOLIDAY_ID NOT NULL NUMBER
BANK_HOLIDAY_DESC VARCHAR2(255)
BANK_HOLIDAY_DATE DATE
3 rows selected
分页：
select * from (
select * from bank_holidays where rownum<=5) where bank_holiday_id not in
(select bank_holiday_id from bank_holidays where rownum<=3)
删除重复数据：
delete bank_holidays where bank_holiday_id in(
select bank_holiday_id from bank_holidays where bank_holiday_date in
(
select bank_holiday_date from bank_holidays GROUP BY bank_holiday_desc, bank_holiday_date having count (bank_holiday_desc) >= 2
)and
bank_holiday_id not in (
select min(bank_holiday_id) from bank_holidays GROUP BY bank_holiday_desc, bank_holiday_date having count (bank_holiday_desc) >= 2
)
)