自己工作用过的SQL代码（1)

SQL Server 2005下的分页SQL其实基本上有三种方法：

1、使用SQL Server 2005中新增的ROW_NUMBER

几种写法分别如下：

 

1SELECT TOP 20 * FROM (SELECT
2   ROW_NUMBER() OVER (ORDER BY Namec) AS RowNumber,
3   *
4FROM
5   dbo.mem_member) _myResults
6WHERE
7   RowNumber > 10000
8
 

1SELECT * FROM (SELECT
2   ROW_NUMBER() OVER (ORDER BY Namec) AS RowNumber,
3   *
4FROM
5   dbo.mem_member) _myResults
6WHERE
7   RowNumber between 10000 and 10020
 

1WITH OrderedResults AS
2
3(SELECT *, ROW_NUMBER() OVER (order by Namec) as RowNumber FROM dbo.mem_member)
4
5SELECT *
6
7FROM OrderedResults
8
9WHERE RowNumber between 10000 and 10020
不管哪种写法，性能都不理想。在8,9万条数据的情况下要运行6秒左右。

2、使用临时表再加存储过程

 

 1BEGIN
 2                DECLARE @PageLowerBound int
 3                DECLARE @PageUpperBound int
 4               
 5                -- Set the page bounds
 6                SET @PageLowerBound = 10000
 7                SET @PageUpperBound = 10020
 8
 9                -- Create a temp table to store the select results
10                Create Table #PageIndex
11                (
12                    [IndexId] int IDENTITY (1, 1) NOT NULL,
13                    [Id] varchar(18)
14                )
15               
16                -- Insert into the temp table
17                declare @SQL as nvarchar(4000)
18                SET @SQL = 'INSERT INTO #PageIndex (Id)'
19                SET @SQL = @SQL + ' SELECT'
20                SET @SQL = @SQL + ' TOP ' + convert(nvarchar, @PageUpperBound)
21                SET @SQL = @SQL + ' m_id'
22                SET @SQL = @SQL + ' FROM dbo.mem_member'
23                SET @SQL = @SQL + ' ORDER BY NameC'
24               
25                -- Populate the temp table
26                exec sp_executesql @SQL
27
28                -- Return paged results
29                SELECT O.*
30                FROM
31                    dbo.mem_member O,
32                    #PageIndex PageIndex
33                WHERE
34                    PageIndex.IndexID > @PageLowerBound
35                    AND O.[m_Id] = PageIndex.[Id]
36                ORDER BY
37                    PageIndex.IndexID
38               
39drop table #PageIndex           
40                END
而使用这种方法，在同样的情况下用时只需1秒。

看样子，row_number是个鸡肋。

3、如果觉得临时表不好，还可以使用SET ROWCOUNT

 

 1begin
 2DECLARE @first_id varchar(18), @startRow int
 3   
 4SET ROWCOUNT 10000
 5SELECT @first_id = m_id FROM mem_member ORDER BY m_id
 6
 7SET ROWCOUNT 20
 8
 9SELECT m.*
10FROM mem_member m
11WHERE m_id >= @first_id
12ORDER BY m.m_id
13
14SET ROWCOUNT 0
15end