说一下我有一张表,每条记录虽然有id但并不是连续的,请问该怎么弄
谢谢
对了说一下,就是我的这个查询并不是之查询一次,需要经常用的一个sql语句
可能这是前10条,下一次可能就是从第十条到第四十条了
对了是MySQL语句
第1个回答 2010-08-03
取n到m行
1.
select top m * from tablename where id not in (select top n id from tablename order by id asc/*|desc*/)
2.
select top m * into 临时表(或表变量) from tablename order by columnname -- 将top m笔插入到临时表
set rowcount n --只取n条结果
select * from 表变量 order by columnname desc
3.
select top n * from
(select top m * from tablename order by columnname) a
order by columnname desc
4.如果tablename里没有其他identity列,那么:
先生成一个序列,存储在一临时表中.
select identity(int) id0,* into #temp from tablename
取n到m条的语句为:
select * from #temp where id0 > =n and id0 <= m
如果你在执行select identity(int) id0,* into #temp from tablename这条语句的时候报错,那是因为你的DB中间的select into/bulkcopy属性没有打开要先执行:
exec sp_dboption 你的DB名字,'select into/bulkcopy',true
5.如果表里有identity属性,那么简单:
select * from tablename where identity_col between n and m
6.SQL2005开始.可以使用row_number() over()生成行号
;with cte as
(
select id0=row_number() over(order by id),* from tablename
)
select * from cte where id0 between n to m
1.
select top m * from tablename where id not in (select top n id from tablename order by id asc/*|desc*/)
2.
select top m * into 临时表(或表变量) from tablename order by columnname -- 将top m笔插入到临时表
set rowcount n --只取n条结果
select * from 表变量 order by columnname desc
3.
select top n * from
(select top m * from tablename order by columnname) a
order by columnname desc
4.如果tablename里没有其他identity列,那么:
先生成一个序列,存储在一临时表中.
select identity(int) id0,* into #temp from tablename
取n到m条的语句为:
select * from #temp where id0 > =n and id0 <= m
如果你在执行select identity(int) id0,* into #temp from tablename这条语句的时候报错,那是因为你的DB中间的select into/bulkcopy属性没有打开要先执行:
exec sp_dboption 你的DB名字,'select into/bulkcopy',true
5.如果表里有identity属性,那么简单:
select * from tablename where identity_col between n and m
6.SQL2005开始.可以使用row_number() over()生成行号
;with cte as
(
select id0=row_number() over(order by id),* from tablename
)
select * from cte where id0 between n to m
第2个回答 2010-08-03
什么数据库?不同数据的sql是不同的.
mysql,postgresql用limit和offset.
sql server 用两次top.
firebird用rows.
其它的我不知道.本回答被提问者采纳
mysql,postgresql用limit和offset.
sql server 用两次top.
firebird用rows.
其它的我不知道.本回答被提问者采纳
第3个回答 2010-08-03
oracle的话语法如下
1.如果需要id排序
select * from (
select t.* , rownum as seq from (
select * from yourTable
order by id )t)
where seq>= m and seq<= n ;
2.如果不需要id排序
select *
from (select t.*, rownum as seq from yourTable t)
where seq >= m
and seq <= n
1.如果需要id排序
select * from (
select t.* , rownum as seq from (
select * from yourTable
order by id )t)
where seq>= m and seq<= n ;
2.如果不需要id排序
select *
from (select t.*, rownum as seq from yourTable t)
where seq >= m
and seq <= n
第4个回答 2010-08-03
SELECT TOP n-m+1 * FROM 表名 WHERE (id NOT IN (SELECT TOP m-1 id FROM 表名))本回答被网友采纳
第5个回答 2010-08-03
select * from table limit m , (n-m);