我们不能使用通过引用“输出”传递的参数来创建SQL Server函数吗？

问题描述

| sql SERVER避免我们在sql函数中将参数传递为输出“按引用传递” 它只是允许我们在程序中这样做 有什么办法可以做到这一点？ 如果不是，请有人能帮助我在Select语句中分配值 像这个例子：

Declare @X as float
set @X 
select  column1,column2,@X = @X+ column1+column2 FROM someView

    

解决方法

        要产生这样的结果，您可以尝试以下解决方案：

SELECT s1.column1,s1.column2,sum(s1.column1 + s1.columns2) as res 
FROM  someView s1 cross join someView s2 
WHERE s1.[OrderColum] <= s1.[OrderColum]
GROUP BY s1.column1,s1.columns2

但是如果您没有一些订购栏，则可以尝试此解决方案

WITH someViewWithOrder AS
(
    SELECT column1,column2,ROW_NUMBER() OVER(ORDER BY (SELECT 1)) AS row_id
        FROM someView
) 
SELECT s1.column1,sum(s1.column1 + s1.columns2) as res
    FROM someViewWithOrder s1
        INNER JOIN someViewWithOrder s2 ON s1.row_id >= b.row_id
GROUP BY s1.column1,s1.columns2;

    ,        这是递归CTE的工作：

WITH CTE AS (
  SELECT
    Column1,Column2,rownum = ROW_NUMBER() OVER (ORDER BY (SELECT 1))
  FROM someView
),RecCTE AS (
  SELECT
    Column1,Total = Column1 + Column2
  FROM CTE
  WHERE rownum = 1
  UNION ALL
  SELECT
    c.Column1,c.Column2,Total = r.Total + c.Column1 + c.Column2
  FROM CTE c
    INNER JOIN RecCTE ON c.rownum = r.rownum + 1
)
SELECT *
FROM RecCTE

    ,        您可以像这样分配结果

Declare @X as float

select @X = sum(column1 + column2) 
FROM someView

计算此方法有效的运行总计（快速）