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

我能做到的最接近

select * FROM( SELECT *, ROW_NUMBER() over (ORDER BY ID ) as ct from [db].[dbo].[table] ) sub where ct > fromNumber  and ct <= toNumber

我猜类似于select * from [db].[dbo]。[table] LIMIT 0,10

其他回答

对我来说,一起使用OFFSET和FETCH很慢,所以我使用了TOP和OFFSET的组合,就像这样(这更快):

SELECT TOP 20 * FROM (SELECT columname1, columname2 FROM tablename
    WHERE <conditions...> ORDER BY columname1 OFFSET 100 ROWS) aliasname

注意:如果在同一个查询中同时使用TOP和OFFSET:

SELECT TOP 20 columname1, columname2 FROM tablename
    WHERE <conditions...> ORDER BY columname1 OFFSET 100 ROWS

然后你会得到一个错误,所以为了同时使用TOP和OFFSET,你需要用子查询来分离它。

如果你需要使用SELECT DISTINCT,那么查询如下:

SELECT TOP 20 FROM (SELECT DISTINCT columname1, columname2
    WHERE <conditions...> ORDER BY columname1 OFFSET 100 ROWS) aliasname

注意:使用SELECT ROW_NUMBER和DISTINCT不适合我。

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

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;

特别是对于SQL-SERVER,您可以通过许多不同的方式实现这一点。对于给定的真实例子,我们取Customer表。

例1:使用"SET ROWCOUNT"

SET ROWCOUNT 10
SELECT CustomerID, CompanyName from Customers
ORDER BY CompanyName

若要返回所有行,请将ROWCOUNT设置为0

SET ROWCOUNT 0  
SELECT CustomerID, CompanyName from Customers
    ORDER BY CompanyName

例2:使用"ROW_NUMBER and OVER"

With Cust AS
( SELECT CustomerID, CompanyName,
ROW_NUMBER() OVER (order by CompanyName) as RowNumber 
FROM Customers )
select *
from Cust
Where RowNumber Between 0 and 10

例3:使用“OFFSET and FETCH”,但是使用这个“ORDER BY”是强制的

SELECT CustomerID, CompanyName FROM Customers
ORDER BY CompanyName
OFFSET 0 ROWS
FETCH NEXT 10 ROWS ONLY

希望这对你有所帮助。

这里有人在sql 2011中讲述了这个功能,令人遗憾的是,他们选择了一个有点不同的关键字“OFFSET / FETCH”,但它不是标准的,然后ok。