SQL Server的LIMIT和OFFSET的等价物？

Question

在PostgreSQL中,有一些Limit和Offset关键字可以很容易地对结果集进行分页.

Sql Server的等效语法是什么？

Answer 1

现在,此功能在SQL Server 2012中变得非常简单.这从SQL Server 2012开始运行.

限制偏移量以在SQL Server中选择11到20行:

SELECT email FROM emailTable 
WHERE user_id=3
ORDER BY Id
OFFSET 10 ROWS
FETCH NEXT 10 ROWS ONLY;

• OFFSET:跳过的行数
• NEXT:所需的下一行数

参考:https://docs.microsoft.com/en-us/sql/t-sql/queries/select-order-by-clause-transact-sql?view=sql-server-2017

Answer 2

相当于LIMIT是SET ROWCOUNT,但如果你想通用分页,最好写这样的查询:

;WITH Results_CTE AS
(
    SELECT
        Col1, Col2, ...,
        ROW_NUMBER() OVER (ORDER BY SortCol1, SortCol2, ...) AS RowNum
    FROM Table
    WHERE <whatever>
)
SELECT *
FROM Results_CTE
WHERE RowNum >= @Offset
AND RowNum < @Offset + @Limit

这里的优点是在您决定更改分页选项(或允许用户这样做)时,偏移和限制的参数化.

注:该@Offset参数应使用基于1的索引为此而不是正常的从零开始的索引.

Answer 3

select top {LIMIT HERE} * from (
      select *, ROW_NUMBER() over (order by {ORDER FIELD}) as r_n_n 
      from {YOUR TABLES} where {OTHER OPTIONAL FILTERS}
) xx where r_n_n >={OFFSET HERE}

注意: 此解决方案仅适用于SQL Server 2005或更高版本,因为这是在ROW_NUMBER()实施时.

Answer 4

您可以在公用表表达式中使用ROW_NUMBER来实现此目的.

;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

Answer 5

特别是对于 SQL-SERVER，您可以通过许多不同的方式来实现这一点。对于给定的实际示例，我们在此处采用了 Customer 表。

示例 1：使用“SET ROWCOUNT”

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

要返回所有行，请将 ROWCOUNT 设置为 0

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

示例 2：使用“ROW_NUMBER 和 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

示例 3：使用“OFFSET 和 FETCH”，但使用此“ORDER BY”是强制性的

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

希望这对您有帮助。

Answer 6

-- @RowsPerPage  can be a fixed number and @PageNumber number can be passed 
DECLARE @RowsPerPage INT = 10, @PageNumber INT = 2

SELECT *

FROM MemberEmployeeData

ORDER BY EmployeeNumber

OFFSET @PageNumber*@RowsPerPage ROWS

FETCH NEXT 10 ROWS ONLY