SQL 查询 排序

/*
    功能：生成测试数据.
*/
 
create table Test_paging(
    id int identity(1,1) not null primary key,
    TestNumber int not null,
    TestName varchar(20) not null,
    TestDept varchar(10) not null,
    TestDate datetime not null
)
go
 
with tep(Number,Name,Dept,Date) as
(
    select 1,cast('0_testname' as varchar(20)),cast('0_DBA' as varchar(10)),getdate()
    union all
    select Number+1,cast(cast(Number as varchar(20))+'_testname' as varchar(20)),cast(cast(Number/500 as varchar(10))+'_DBA' as varchar(10)) ,getdate()
    from tep
    where Number<=20000000
)
insert into Test_paging(TestNumber,TestName,TestDept,TestDate)
select Number,Name,Dept,Date from tep option(maxrecursion 0)
 
--添加索引（我有测试没有索引的情况，2012的优势更加明显，但是我们的数据库不可能不建索引的，故可忽略没有索引的情况）
create nonclustered index IX_TestDept on Test_paging(
    TestDept
) include
(
    TestName,TestDate
) 
go




/*
    功能：测试2012版本中offset/fetch分页.
*/
 
dbcc dropcleanbuffers
dbcc freeproccache
 
set statistics io on
set statistics time on
set statistics profile on
 
declare   
    @page int,    --第@page页
    @size int,    --每页@size行
    @total int    --总行数
 
select @page=20,@size=10,@total=count(1) from Test_paging where TestDept = '1000_DBA' 
 
select 
    TestName,TestDept,TestDate,@total
from 
    Test_paging
where 
    TestDept = '1000_DBA' 
order by id offset (@page-1)*@size rows fetch next @size rows only
 
set statistics io off
set statistics time off
set statistics profile off




/*
    功能：测试2005/2008版本中row_number分页.
*/
 
dbcc dropcleanbuffers
dbcc freeproccache
 
set statistics io on
set statistics time on
set statistics profile on
 
declare   
    @page int,    --第@page页
    @size int,    --每页@size行
    @total int
 
select @page=20,@size=10,@total=count(1) from Test_paging where TestDept = '1000_DBA'
 
select TestName,TestDept,TestDate,@total from
(
    select 
        TestName,TestDept,TestDate,row_number() over(order by ID) as num 
    from 
        Test_paging
    where 
        TestDept = '1000_DBA'
) test where num between (@page-1)*@size+1 and @page*@size order by num 
 
set statistics io off
set statistics time off
set statistics profile off




/*
    功能：测试2000版本中top分页.
*/
 
dbcc dropcleanbuffers
dbcc freeproccache
 
set statistics io on
set statistics time on
set statistics profile on
 
declare   
    @page int,    --第@page页
    @size int,    --每页@size行
    @total int    --总行数
 
select @page=20,@size=10,@total=count(1) from Test_paging where TestDept = '1000_DBA' 
 
 
select TestName,TestDept,TestDate,@total from
(
    select top(@size) id,TestName,TestDept,TestDate from 
    (
        select top(@page*@size) id,TestName,TestDept,TestDate
        from Test_paging 
        where TestDept = '1000_DBA'
        order by id
    )temp1 order by id desc
)temp2 order by id 
 
set statistics io off
set statistics time off
set statistics profile off

order by convert(VARCHAR(10),updatetime,120) DESC