各種數據庫獲取前n條記錄/分頁

MYSQL --- LIMIT
select * from t_table LIMIT 2,5;

MSSQL 2000 --- top
select top 5 * from t_table
分頁:檢索從第六名開始一共三個人的信息
select top 3 * from t_table where field not in
(select top 5) field from t_table order by field2 desc)
order by field2 desc

MSSQL 2005（兼容2000）--- ROW_NUMBER()
新特徵: ROW_NUMBER()表示每一行數據在結果集中的行號(從1開始)
格式：ROW_NUMBER OVER(排序規則)
select ROW_NUMBER() OVER(order by field desc),field2,field3 from t_table

返回3-5行的數據：
select * from
(
select ROW_NUMBER() OVER(order by field desc) row_num, field2,field3
from t_table
)
where a.row_num >=3 and a.row_num <=5

注意：ROW_NUMBER(）不能用在where語句中

 

如有什麼錯誤請指出來，本人也好改正！

ORACLE --- rownum、ROW_NUMBER()（同MSSQL2005）
select rownum, field2,field3 from t_table
前6行數據：select * from t_table where rownum <=6
3-5行的數據：(此SQL語句無效，結果爲空,藉助MSSQL 2005中的ROW_NUMBER()實現)
select * from t_table where rownum between 3 and 5

DB2 --- FETCH、ROW_NUMBER()(同MSSQL 2005)
FETCH：提取前n條記錄
語法：FETCH FIRST n ROWS ONLY
提取前6條記錄：select * from t_table FETCH FIRST 6 ROW ONLY

提取6-8的記錄：
select * from t_table
where field not in
(
select field from t_table
order field2 desc
FETCH FIRST 5 ROWS ONLY
)
order by field2 desc
FETCH FIRST 3 ROWS ONLY

注意：fetch需要放在sql中order by後的位置   

 

 

如有什麼錯誤請指點出來，本人也好改正錯誤，謝謝！