使用Oracle SQL 删除重复记录及分页 备案

使用Oracle SQL 删除重复记录及分页 备案

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
)

)