几种分页sql写法测试-蒲公英云

几种分页sql写法测试

1.创建测试环境，(插入100万条数据大概耗时5分钟)。

create database DBTest
use DBTest
--创建测试表
create table pagetest
(
id int identity(1,1) not null,
col01 int null,
col02 nvarchar(50) null,
col03 datetime null
)
--1万记录集
declare @i int
set @i=0
while(@i<10000)
begin
    insert into pagetest select cast(floor(rand()*10000) as int),left(newid(),10),getdate()
    set @i=@i+1
end

2.几种典型的分页sql，下面例子是每页50条，198*50=9900，取第199页数据。

--写法1，not in/top
select top 50 * from pagetest 
where id not in (select top 9900 id from pagetest order by id)
order by id
--写法2，not exists
select top 50 * from pagetest 
where not exists 
(select 1 from (select top 9900 id from pagetest order by id)a  where a.id=pagetest.id)
order by id
--写法3，max/top
select top 50 * from pagetest
where id>(select max(id) from (select top 9900 id from pagetest order by id)a)
order by id
--写法4，row_number()
select top 50 * from 
(select row_number()over(order by id)rownumber,* from pagetest)a
where rownumber>9900
select * from 
(select row_number()over(order by id)rownumber,* from pagetest)a
where rownumber>9900 and rownumber<9951
select * from 
(select row_number()over(order by id)rownumber,* from pagetest)a
where rownumber between 9901 and 9950
--写法5，在csdn上一帖子看到的，row_number() 变体，不基于已有字段产生记录序号，先按条件筛选以及排好序，再在结果集上给一常量列用于产生记录序号
select *
from (
    select row_number()over(order by tempColumn)rownumber,*
    from (select top 9950 tempColumn=0,* from pagetest where 1=1 order by id)a
)b
where rownumber>9900

3.分别在1万，10万(取1990页)，100(取19900页）记录集下测试。

declare @begin_date datetime
declare @end_date datetime
select @begin_date = getdate()
<.....YOUR CODE.....>
select @end_date = getdate()
select datediff(ms,@begin_date,@end_date) as '毫秒'