在PostgreSQL中,有Limit和Offset关键字,可以非常容易地对结果集进行分页。
SQL Server的等效语法是什么?
在PostgreSQL中,有Limit和Offset关键字,可以非常容易地对结果集进行分页。
SQL Server的等效语法是什么?
当前回答
您可以在公共表表达式中使用ROW_NUMBER来实现这一点。
;WITH My_CTE AS
(
SELECT
col1,
col2,
ROW_NUMBER() OVER(ORDER BY col1) AS row_number
FROM
My_Table
WHERE
<<<whatever>>>
)
SELECT
col1,
col2
FROM
My_CTE
WHERE
row_number BETWEEN @start_row AND @end_row
其他回答
我假设,在c#表达式/LINQ语句的跳过和采取生成下面的SQL命令
DECLARE @p0 Int = 1
DECLARE @p1 Int = 3
SELECT [t1].[Id]
FROM (
SELECT ROW_NUMBER() OVER (ORDER BY [t0].[Id]
FROM [ShoppingCart] AS [t0]
) AS [t1]
WHERE [t1].[ROW_NUMBER] BETWEEN @p0 + 1 AND @p0 + @p1
ORDER BY [t1].[ROW_NUMBER]
另一个例子:
declare @limit int
declare @offset int
set @offset = 2;
set @limit = 20;
declare @count int
declare @idxini int
declare @idxfim int
select @idxfim = @offset * @limit
select @idxini = @idxfim - (@limit-1);
WITH paging AS
(
SELECT
ROW_NUMBER() OVER (order by object_id) AS rowid, *
FROM
sys.objects
)
select *
from
(select COUNT(1) as rowqtd from paging) qtd,
paging
where
rowid between @idxini and @idxfim
order by
rowid;
因为,我测试了更多次这个脚本更有用的100万条记录,每页100条记录分页工作更快,我的PC执行这个脚本0秒,而与mysql相比有自己的限制和偏移约4.5秒得到结果。
有些人可能不理解Row_Number()总是按特定字段排序。如果我们只需要按顺序定义行,应该使用:
Row_number () over (order by (select null))
SELECT TOP {LIMIT} * FROM (
SELECT TOP {LIMIT} + {OFFSET} ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS ROW_NO,*
FROM {TABLE_NAME}
) XX WHERE ROW_NO > {OFFSET}
解释:
{LIMIT}:每页的记录数 {OFFSET}:跳过记录的个数
您可以在公共表表达式中使用ROW_NUMBER来实现这一点。
;WITH My_CTE AS
(
SELECT
col1,
col2,
ROW_NUMBER() OVER(ORDER BY col1) AS row_number
FROM
My_Table
WHERE
<<<whatever>>>
)
SELECT
col1,
col2
FROM
My_CTE
WHERE
row_number BETWEEN @start_row AND @end_row
在Aaronaught的解决方案的基础上增加了一点变化,我通常对页码(@PageNum)和页面大小(@PageSize)进行参数化。这样,每个页面点击事件只发送请求的页码和可配置的页面大小:
begin
with My_CTE as
(
SELECT col1,
ROW_NUMBER() OVER(ORDER BY col1) AS row_number
FROM
My_Table
WHERE
<<<whatever>>>
)
select * from My_CTE
WHERE RowNum BETWEEN (@PageNum - 1) * (@PageSize + 1)
AND @PageNum * @PageSize
end