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Page in each database

2018年04月17日 ⁄ 综合 ⁄ 共 618字 ⁄ 字号 评论关闭

Oracle:

select *
  from ( select a.*, rownum rnum
           from ( YOUR_QUERY_GOES_HERE -- including the order by ) a
          where rownum <= MAX_ROWS )
where rnum >= MIN_ROWS
/

 

 

 

SQL Server:

select * from

(

select row_number() over(order by rownum) as row_num, * from

(

  select col1,col2,col3,row_number() over (order by col4 desc) as rownum

 from table_1

) as dt1 where dt1.rownum<50) as dt2

where dt2.row_num>=25;

 

 

 

DB2:

select * from

(select rownumber() over() as row_num, inner_table.* from

    (select * from user_master order by user_name desc fetch first 50 rows only) as inner_table)

) as outer_table where outer_table.row_num>25

optimize for 50 rows;

 

 

Conclusion:

1. use analytical function or keyword

2. embeded subquery

 

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